What is Botflies (Maggots)?
Botflies, or Cuterebra, are larvae that form in the tissues of animal hosts. After they hatch, these larvae can enter the animal’s body through any opening, such as a skin wound, mouth, ear, or nose, and settle into the tissues and continue their life cycle. There are more than 25 species of these “maggot” like larvae, and they are found in tropical regions, Mexico, the United States, and Canada. They can be also referred to as “warbles” during the larvae stage. Cuterebra mostly infest rabbits or numerous types of rodents. If a dog is outside often or is hunting rabbit, they are more susceptible to getting larvae into their body.
Botflies in dogs occur when the Cuterebra larvae enter the body of a dog, and insert themselves into the tissue of the dog and begin their lifecycle within that tissue.
Symptoms of Botflies (Maggots) in Dogs
If your dog has been infected with a botfly within his tissue, he will exhibit certain symptoms. Symptoms of a botfly infestation are:
- Lump or bump on the skin
- Scratching or licking of the area
- Small hole in the middle of the lump
- Swelling
- Skin abscess
Types
Although Cuterebra species usually infect rabbits or other outdoor rodents, a dog may become a victim if he is outdoors hunting. Different Cuterebra species can infect your dog, although some are more common than others. Types of these pests that can infect your dog are:
- Cuterebra species (rabbit Cuterebra fly)
- Warble flies (Hypoderma species)
Causes of Botflies (Maggots) in Dogs
Cuterebra is a common North American fly that is attracted mostly to rodents, rabbits, or small outdoor mammals. Causes of infestation of a botfly in a dog can include:
- Being outdoors often in the summer months
- Being around rabbit burrows
- Hunting rabbit
- Interacting with rodents or rodent nesting areas
Diagnosis of Botflies (Maggots) in Dogs
If you suspect your dog has a botfly in their tissue, do not attempt to remove it on your own. You can seriously cause harm to your pet if you do this. It is important to take your dog to a veterinarian to have it diagnosed properly and removed professionally.
Your veterinarian will take a close look at the open or draining wound beneath the hair of the dog. Since the hair will be matted from any discharge, he may need to shave around the infected area to get a closer look. The wound will be a lump or have a lot of swelling and there will be a hole in the middle of it, and oftentimes the actual larvae will be able to be seen peeking out to get some air.
Diagnosis is done by a visual study of the warble hole, and the veterinarian may choose to do other tests to rule out any other parasites or bacterial infection that could be caused by the botfly.
Treatment of Botflies (Maggots) in Dogs
Treatment for a botfly infestation in your dog should only be done by a veterinarian to ensure full safety and recovery of the dog. The veterinarian knows how to remove the botfly safely so no harmful substances from the Cuterebra are released into your dog’s bloodstream. Complications can happen if the larvae rupture during the removal process. Treatment includes:
Anesthesia
The medical professional will need to give your dog anesthesia to keep him relaxed and pain-free during the removal of the botfly.
Removal
The veterinarian will use a tool to safely remove the botfly from the tissue, being very careful not to squeeze too much or rupture the larvae.
Medications
It is possible that the veterinarian may prescribe an antibiotic once the botfly is removed, depending on the seriousness of the infestation. This is not always necessary, but can occur and the veterinarian will make the decision on this once the botfly is successfully removed.
Recovery of Botflies (Maggots) in Dogs
After the removal of the botfly, it is important to keep your eye on the affected area. Your veterinarian will communicate with you on what to watch for in terms of healing or any complications. If any complications from the wound site occur, contact the veterinarian without hesitation. Once the botfly has been removed successfully by the veterinarian, prognosis is good for your dog. He will be back to normal in no time!
Prevention is crucial to keep the botflies away from your loved one. Try to keep your dog away from areas where there are a lot of rabbits or rodents; check for burrows and nests of these outdoor mammals and try to keep your dog out of those areas. When the weather becomes warmer, your dog has a higher chance of being exposed to botflies; the Cuterebra lay their eggs in the summer and early fall seasons. Check your dog every night for anything foreign on the skin or beneath the skin.
Botflies (Maggots) Questions and Advice from Veterinary Professionals
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Hi~
My family and I are vacationing in Mexico. On Tuesday we noticed all three dogs were infested (& I mean INFESTED) with botfly larva day. I bathed them all with medicinal shampoo until they could be seen by a vet. Well, the next day my husband and I were also both infested. Last night, the ER doctor prescribed us Ivermectin & today all 3 dogs will be getting Ivermectin injections (they are also already taking doxycycline). My question is this: what now? Do I need to bug bomb our house? Our yard? Rewash all of our clothing, bedding, dishes...? Does our furniture need to be doused in Lysol? I’m very concerned with 1) bringing this infestation home with us & 2) subjecting anyone else to this incredibly disturbing experience. Any suggestions would be greatly appreciated. Thank you
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So my dog was infested with maggots near his eye my vet treated a day with medicine in it which forced dead maggots to fall out and the next day they cleaned it and asked to apply an ointment.. when I came home I noticed my dog is still at discomfort and trying to itch his eye with his paw. I understand this procedure was done few hours ago but what if there's a maggot still in there? Nobody can actually see inside should I just tell my vet that I don't see it but my dog is still itching it or is it because of infection? Because the whole has now started to heal with in few hours. I'm worried that any dead maggot isn't there somewhere or even a live one.
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I am positive I found larvae in my kitchen. Should I be concerned for my pets? Is There a way to prevent them actually knowing they wont have parasite?
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How cN I know if my dog has botflies??
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Thank you for your question. Botflies can usually be found as skin lumps around a centimetre in size with a fistula (hole) in the skin. These types of infestation are common in summer and autumn, especially if your dog runs in fields or you live around farm land. Infections are usually with the rabbit fly (Cuterebra spp.), but on rare occasions they may be infected by Hypoderma spp. or Dermatobia hominis. After around thirty days the larvae fall out of the lesion and continue their development. If you believe your dog has botflies or if he has any unexplained lump, please visit your Veterinarian. Regards Dr Callum Turner DVM
I foolishly removed a botfly larvae from my dog on my own. As far as I can tell the larvae came out whole and Did not rupture, and I cleaned the hole afterwards, should I still see a vet?
Hello
My dog had been scratching his eyes and nose making his eye blood red on thursday he also started doing the reverse sneeze very repeatedly.I gave him a bath and did not notice anything wrong with him sometime he gets sand spurs from the yard so I thought he propably scratch his eye with one.saturday his eye was clear and normal. yesterday evening he started scratching again that whe I saw a hole in the side of the nose by the eye he had been scratching I did not know what it was I thought something bit him and them I saw the larvae picking out of the hole I put vaseline on the wound and the larvae started coming out more until i was able to take it out with a tweezer i call the vet but they will not see him until wednesday. I am scared will he have Moore inside of him I cannot see him scratching anywhere else but he is a yorkie and has medium to long hair should I shave him just to be on the safe side. We have lots of wild bunnies in the yard. Will he get sick from this the reverse sneeze has stopped. He seems to bee back to normal playing running I have not let him go in the yard at all.help please
Thank you for very helpful information!
My dog has these white tiny egg looking bumps separate from each other and has no holes on bumps she is a outside dog and a beagle.
I'm concerned about her.please text back.
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We were at the cet today because we noticed some lumps on our dogs which when squeezed by the vet maggots came out
All where removed and given antibiotics but since we got home we have noticed new lumps keep coming out is this normal with botflies and do we need to wait or take them back to the vet. We have kept then inside to avoid reexposure. The vet told us to squeeze any new one we found is this safe??
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It is possible for new lumps with more maggots to appear during treatment. You can squeeze the lumps but I generally advise against owners squeezing the lumps themselves as rupturing the maggots may release toxins into your dog; but many people manage to squeeze the lumps without problems. Ivermectin should be given as well. Regards Dr Callum Turner DVM
I'm doing a project for school and its due 4/10/17 and it must include and intreview. May you please answer these 10 questions for me please.
1) What is the botfly common name and scientific name?
2) Where is botfly larvae found (what is the geographical range)?
3) wha are the symptoms for humans?
4)what causes the infection?
5)Is there a vector?
6)What is the life cycle or progression?
7) What is the treatment?
8)How was botfly larvae discovered (Who,when,where,and why)?
9)What steps should you take to avoid a botfly larvae?
10)Is there a cure or treatment?
Thank you for you time.🙏😊
My dog has maggots on his anus that have burrowed into a small hole , vet thinks its the anal gland . The treatment perscribed has me very worried, he gave him nexgard
My dog has maggots on his anus that have burrowed into a small hole, vet thinks its the anal glands possibly. The treatment prescribed has me very worried, he gave him Nexgard for 3 months. I can't find anything that says this treatment is for my dog's current issue, whats worrying me is the amount of info online that describes Nexgard as potentially toxic and my dog could develop serious side effects etc. Did the vet suggest the correct medicine and do I have anything to worry about?
Thank you
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Hi, I just recently bought a lemon spotted beagle puppy and when I brought him home he had a few fleas, I managed to get rid of those, but he is even itchier now and can't even play without stopping every few seconds to scratch. He's started losing a little hair around his stomach and he's developing rough patches there as well. I found what looked like a maggot under his skin and it started to poke out so I instinctively pulled it out.. is it likely that he has more? And are his symptoms caused by the maggot or possibly another underlying condition?
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It is possible that there would be more botfly larvae under the skin, but it is best for them to be removed by a Veterinarian as rupturing the larvae may cause complications. The itching maybe caused by more botfly larvae, other parasites (mites), bacterial or fungal infections; your Veterinarian with thoroughly examine Kopper’s skin and may perform skin scrapings to detect any parasites or infections present. Apart from removing any other botflies, your Veterinarian may also prescribe antibiotics and ivermectin. Regards Dr Callum Turner DVM
Thank you for your help!
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Please can u tell if my friends dog who has been infested with botflies co come to my house can her dog get me or any other humans infected by this botfly infestation
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It is possible that if your friend’s dog had larvae on her hair (before burrowing into the skin), it is possible that the larvae may have moved across to your dog (highly unlikely) whilst playing etc… But if the larvae had already burrowed into the skin, there wouldn’t be a risk of transmission. The larvae migrate under the skin to different points (depending on the species) on the body until they exit the skin falling to the ground to pupate. Cuterebra spp. (botfly most probably infected your friend’s dog) may infect humans but is extremely rare. If you have concerns, you may visually check your dogs skin (head, neck and body are most common) for large pores which are breathing holes. If you detect any, visit your Veterinarian for advice. Regards Dr Callum Turner DVM
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I was about to purchase a miniature schnauzer puppy when the breeder said I had to wait a few days because she found a botfly on him and she had to treat it first. Should I be concerned? Should I not purchase this puppy? I have another pet in my house as well. Are there certain red flags I should me looking for?
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Botflies affect dogs by burrowing under the skin and migrating to different areas on the body (depending on the species of the botfly, usually Cuterebra), one they mature they exit the skin and fall to the floor. Successful treatment involves surgical extraction and medical treatment. Once as long as there is no involvement of the central nervous system, dogs can make a full recovery. Ask to speak with the puppy’s Veterinarian (if possible) to ask about the severity and treatment given. Regards Dr Callum Turner
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So I took my dog to Arkansas to visit family three weeks ago. About two weeks ago she came down with a respiratory infection that eventually required intubation to assess her airway. Turns out she has an advanced collapsed trachea, and mega esophagus and treatment for aspiration pneumonia. She's seemed to be getting better, but three days ago the cough became markedly worse, with wheezing and what sounds in humans like stridor. She spent a night and the next day trying to clear what i assumed was a mucus plug. I did give her a few doses of hycodan so she could rest, made sure her gums were pink but last night she finally coughed out the foreign object. Turns out it was approximately 1cm botfly larvae. Still moving!!! The cough has became just a small nuisance at this point at is 95% better. The vet didn't seem entirely convinced that this thing has been in there this whole time, and stated that he's never heard of this happening. I'm wondering if you've ever heard of this, if the larvae would have incubated and survived in there, if there's a need for antiparacitic meds at this point or is it likely an isolated organism. Currently she's finishing a round of augmentin and taking Benadryl for the likely reaction the maggot caused. Thanks!
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I do not know of botfly larvae being coughed up; but there are other parasitic worms which move between the lungs and the gastrointestinal tract by being coughed up then swallowed, but these worms are much thinner than botfly larvae. The cough most probably is attributable to the collapsed trachea; however, medicine is never a straightforward business and cases are very rarely textbook, but if there were a botfly larva in the respiratory tract it would cause more irritation and distress than you described. I wouldn’t see any harm in giving Laika an anthelmintic just to be on the side of caution. Regards Dr Callum Turner DVM
My dogs are infested with botflies, I am sure now not only because the so much research I did, but because literally the ugly little monsters are coming out of their skin. I already spent with one dog something close to $1000, because she was so sick, they did exams for heart-worms and intestine infections and something else and everything produce good results, they never thought about maggots, eventhough I mentioned to the dr. about a red spot on her belly. They are treating my dog for eye infection and asked me to buy a de-wormer (I bought 7 Way Dewormer (Sentry worm x plus). Unfortunately not only my dog is still sick but a second one is now having the similar symptoms (breathing problems, eye problems anxiety, and the weird bugs that I am taking out) the bad part is that I do not always succeed. :( sometimes they break and sometimes I don't get them out. I just can't understand, how can I take the dogs to the vet any time they have a new bug coming out? They already took $1000 for nothing and I used a credit card that I don't know how I am going to pay :( What can I do? I am desperate. I live in a country farm where my dogs run free every day, should I keep them in the house all the time? :'( Help please! Thank you
My dog has han a moggot infection for a week and a half she lost her tail to the infection and i just want to know can she die from this
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Hello, I recently got a puppy that's a Jack Terrier Mix. When I got her she was about 9 weeks. Lately I've been noticing she's been itchy and scratching herself so I bought her a flea shampoo and took her several flee baths, but she kept scratching herself. Last night I had her on my lap and I we were watching a movie. Then I saw something on my ankle. I look closer and it started to move! I thought I was hallucinating so I turned on my light and look took a better look at it and it was a maggot! It was very tiny and flat. I'm not sure if it came from my puppy when she was laying on my lap, but I'm very worried. Please give me advice, anything will help.
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Botfly infections are rare in puppies as they generally get infected by being close to areas occupied by rodents or wildlife; it generally takes thirty days for a larvae to fall from the skin. If the maggot originated from Luna, you may be able to find a hole in the skin where the maggot originated from; but dogs may pick up maggots, worms and other debris whilst walking around which they may then shed in the house. There are different types of larvae / maggots depending on your location, the link below contains a picture of a typical botfly larva. Regards Dr Callum Turner DVM
www.merckvetmanual.com/integumentary-system/cuterebra-infestation-in-small-animals/overview-of-cuterebra-infestation-in-small-animals
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Hi, is there any treatment from stoping the eggs from laying on the dogs, i live in west Africa and have recent noticed a number of such maggots on my dog and i am concerned that once i have them removed they will return and i don't know is there is a solution to avoiding the issue occurring in the first instance. Thanks
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There is currently no approved preventative medication against botflies (cuterebriasis); the eggs aren’t laid on the dogs but on grass which hatch once they come into contact with a warm host leading to infestation. Whilst there are no preventative medications; topical insecticides like fipronil and imidacloprid maybe of benefit, otherwise keep Zeus away from long grass and areas where he is likely to get an infection. Regards Dr Callum Turner DVM
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Hey I have a question I just recently rescued a puppy that was in the middle of traffic when we got her home she had two lumps one small but closed and the other was extremely large I started searching for answers and I came across botflys so I decided to try and squeeze it out the small one had green pus come out along with a worm that looked to be dead then I squeezed the other which took a little longer but was able to remove it my question is after removal what should I put on it I've been using proxcide and alcohol and antibiotic ointment is there something else I could possibly use or will this heal it??
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A lump on the skin with a small breathing hole is indicative of botflies. Squeezing botfly lesions can be dangerous and lead to complications, especially if they rupture internally. The green discharge you describe probably indicates an infection and antibiotics would need to be prescribed by your Veterinarian (they are usually prescribed as a preventative measure as well). For the lesions themselves, flushing with saline water along with the systemic antibiotics is usually enough to resolve the condition; otherwise, surgical debridement may be required. Regards Dr Callum Turner DVM
Hello, I recently got a puppy that's a Jack Terrier Mix. When I got her she was about 9 weeks. Lately I've been noticing she's been itchy and scratching herself so I bought her a flea shampoo and took her several flee baths, but she kept scratching herself. Last night I had her on my lap and I we were watching a movie. Then I saw something on my ankle. I look closer and it started to move! I thought I was hallucinating so I turned on my light and look took a better look at it and it was a maggot! It was very tiny and flat. I'm not sure if it came from my puppy when she was laying on my lap, but I'm very worried. Please give me advice, anything will help.
Thin and flat sounds like a tapeworm. Take a fecal sample to your vet for a floataiin test.
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