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What are Protozoan Parasites?

A parasite is an organism that lives on or in another organism and gets its food and shelter at the expense of its host. More common than we think, parasites invade humans and animals and manifest in disease, some of which may cause substantial damage to the intestinal tract. One class of parasites that can cause disease is protozoa, one-celled organisms that often cause their host little to no harm. However, some single cell organisms are highly injurious to canines, causing severe diarrhea, excessive weight loss, general sickliness and even death. Due to acute or chronic diarrhea, a canine may become dehydrated. Malnutrition is also a particularly serious outcome of intestinal protozoa, and is particularly dangerous for puppies and adolescent dogs who have underdeveloped immune systems, or dogs that are immunocompromised. 

Two common intestinal parasites found in canines are Coccidia, microscopic protozoans that live in the intestinal wall. and Giardia, the most common intestinal parasite worldwide. Giardiasis, an infection of the small intestine caused by the presence of Giardia, occurs when dogs ingest infected offspring that are shed in another animal's feces.  Though most dogs with giardiasis will not present with symptoms such as chronic diarrhea or vomiting, the presence of the parasite may still lead to a malabsorption of nutrients, damage to the intestinal lining and problematic digestion. A dog with giardiasis may not demonstrate a change in appetite, but will still experience weight loss. If symptoms do materialize, the dog will likely have acute or intermittent diarrhea. Another intestinal parasite found in canines is Coccidia, tiny parasites that can cause an infectious disease called coccidiosis. As with giardiasis, dogs may carry the parasite, but be asymptomatic. Puppies or immunocompromised dogs may have particularly watery diarrhea mixed with mucus or blood. If left untreated, severe cases of coccidiosis may be fatal. 

Unsanitary or overcrowded kennels, pet shops and breeding facilities are commonly contaminated with intestinal parasites. Parks and lawns also provide dogs with opportunities to ingest other dogs’ feces, the most common way that dogs spread infection.

A parasite is an opportunist organism that feeds off its host. Protozoan parasites may invade a dog’s intestinal tract and cause infections such as Coccidia and Giardia.

Protozoan Parasites Average Cost

From 207 quotes ranging from $200 - $500

Average Cost

$250

Symptoms of Protozoan Parasites in Dogs

  • Dogs may be asymptomatic
  • Acute or sporadic diarrhea
  • Bloody or mucoid stool
  • Weight loss

Types

Coccidia

Coccidia are intestinal protozoans that live in the intestinal wall.  Coccidia are often spread when the canine eats the infected feces of another animal.  While most dogs with coccidiosis are often asymptomatic, puppies and immunocompromised dogs may develop severe bloody, mucoid diarrhea. In such cases, a lack of veterinary treatment may cause death.

Giardia

Giardia, the most common intestinal parasite worldwide, are intestinal protozoans that live in the small intestine of dogs. Infection with Giardia is common, but disease is rare. Like Coccidia, young and immunocompromised animals may develop gastrointestinal illness featuring severe diarrhea, dehydration and weight loss.  Older, healthy dogs are usually asymptomatic.

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Causes of Protozoan Parasites in Dogs

  • Ingestion of parasite through feces or infected rodents
  • Contaminated water
  • Unsanitary and overpopulated environments
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Diagnosis of Protozoan Parasites in Dogs

The presence of protozoan parasites is not always easy to detect. The veterinarian will perform a routine examination, paying attention to the dog’s appearance, reported symptoms and medical history.  The primary diagnostic tool is a stool sample, though, due to the small size of the protozoa and its intermittent appearance, a fecal examination must be repeated every few days. The stool is examined microscopically for presence of protozoal parasites.

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Treatment of Protozoan Parasites in Dogs

Even if the stool sample doesn’t reveal the presence of parasites, a veterinarian will often treat the dog empirically. An antiparasitic drug may be prescribed to kill Giardia and Coccidia in the intestine. A sulfa-based antibiotic may be given, as well as treatment for dehydration.

Both of these infections have the potential to cause severe diarrhea which can lead to serious consequences, if not treated with therapy for the dehydration that can result. Your veterinarian may feel it necessary to hospitalize your pet and provide intravenous fluids and antidiarrheal medication until she feels that he is stabilized enough to return home.

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Recovery of Protozoan Parasites in Dogs

The dog’s living environment must be safely treated to avoid re-infection.  Other dogs in frequent, close contact should also receive treatment. For healthy dogs with symptoms, a full recovery should occur through the administration of proper medications and the maintenance of a sanitary environment.

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Protozoan Parasites Average Cost

From 207 quotes ranging from $200 - $500

Average Cost

$250

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Protozoan Parasites Questions and Advice from Veterinary Professionals

Need pet health advice? Ask a vet

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Ask a Vet

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star pup

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Treeing Walker Coonhound

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9 Weeks

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Fair severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Fair severity

Has Symptoms

Weight Loss Loose Stools

I had stool checked on puppy vet said there were protozoa swimming in feces but it wasn't giardia or coccidia. He was puzzled just told me to give metronidazole for 5 days. Any ideas what other protozoa it could be? vet also checked for parvo and it was negative. puppy still has appetite but looks gangly 2 days of treatment so far

Aug. 20, 2018

star pup's Owner

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Dr. Michele K. DVM

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1611 Recommendations

There are a number of protozoal parasites that can infect dogs, and most of them are treated similarly. 2 days of treatment is not very much time, and it may take a little longer to see effects. If you don't see an improvement over the 5 days, it would be best to have a recheck with your veterinarian and have another stool sample analyzed.

Aug. 20, 2018

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Sully

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German Shepherd

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10 Months

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Moderate severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Moderate severity

Has Symptoms

Vomiting

Our 10 month old German Shepherd has had diarrhea and lack of appetite since Monday, yesterday he began vomiting. His appetite had returned but nothing would stay down. He had 2 normal/firm bowel movements but vomited about 5 times last night. We took him to the vet today and they did a stool sample and found 2 strains of bacteria 1 a protozoan and 2 a spirochete. I am mainly concerned about the amount of prescriptions he was sent home with. Literally 3 different antibiotics, nausea medication, and sucralfate. Is this excessive? This is going to completely knock out his gut flora. Also, side effects of these drugs is all of the symptoms he already has. Would you continue with all medications? (albons, metronidazole, cephalexin,sucralfate,amoxicillin)

Aug. 10, 2018

Sully's Owner

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3320 Recommendations

Sully is on a lot of medication for certain, however it is down to your Veterinarian to determine whether treatment should be given in one go or if Sully should be treated in stages, without knowing the specific infections I cannot say whether I would treat the same way or not; if you have concerns you should discuss with your Veterinarian about their treatment plan. Regards Dr Callum Turner DVM

Aug. 10, 2018

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Rocky

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Labradoodle

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5 Months

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Moderate severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Moderate severity

Has Symptoms

Diarrhea Constantly.

Our puppy has had diarrhea for a 6 week he is 5 months old they did one fecal exam given pro-pectalin anti diarrheal gel, then was given metronidazole 250 mg and trimeth sulfa 480mg on may 4 he still has diarrhea. very low energy now!!!! he is usually very active. his stools vary from not hardly formed to very runny and muscus. Iam very worried what to try next.I have been giving him Advita (probiortic) for two weeks now. He is not stressed. I took his food away for a week and fed him chicken and rice nothing changed.

May 28, 2018

Rocky's Owner

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3320 Recommendations

Chronic diarrhoea may be caused by parasites, infections, dietary intolerance, poisoning, stress among other causes; I would recommend having another faecal examination done to determine if there are any protozoan parasites remaining. If you have already used metronidazole, there isn’t really anything else I can recommend without examining Rocky first. Further testing is required to help narrow down a cause. Regards Dr Callum Turner DVM

May 29, 2018

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jax

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Labradoodle

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1 Year

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Moderate severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Moderate severity

Has Symptoms

Diarrhea
Lethargy
Panting
Throwing Up

our dog has had diarrhea since the week before christmas. it was bloody we took him to the vet they put him on antibiotics and that solved the bloody stool. however the diarrhea has been constant now he is lethargic panting and doesn't want to eat. we have took him to multiple vets and they all prescribe the same thing and we put him on a low fat diet. we have tried just chicken and rice and he ate that and now he wont eat anything. nothing has helped he is up to date on all shots dewormer

Feb. 11, 2018

jax's Owner

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3320 Recommendations

I can see that your Veterinarian(s) have treated the common causes of diarrhoea with Flagyl (metronidazole) for infections; prednisone for colitis; and ondansetron for nausea. If a faecal test hasn’t been carried out yet, I would recommend that one is to look for signs of protozoan parasites; but dietary issues, stress among other issues may also cause diarrhoea. Regards Dr Callum Turner DVM

Feb. 11, 2018

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Polo Bitcoin

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Mal-shi

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3 Months

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Mild severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Mild severity

Has Symptoms

Diarrhea, Weakness, Sleepy,

Hi, my 3 months dog had diarrhea yesterday morning, his stool was bloody and with awful smell. He lost his appetite, didn’t eat and drink, he slept all day. There was no stool all day. Today he ate very little, but his today’s stool was like normal a little bit diarrhea. He is not as usual but there is a big difference between today and yesterday. Can you help me please? Is it very dangerous? What should I do?Thank you

Jan. 30, 2018

Polo Bitcoin's Owner

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Dr. Michele K. DVM

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1611 Recommendations

Thank you for your email. Puppies are very susceptible to parasites and infectious disease, and Polo should be seen as soon as possible . Your veterinarian will be able to examine him, recommend any tests or treatments that may be necessary, and give Polo treatment that he needs. I hope that he is okay.

Jan. 31, 2018

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Protozoan Parasites Average Cost

From 207 quotes ranging from $200 - $500

Average Cost

$250