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What is Biting His Skin?

Your dog will occasionally get a little itchy and will use his paws or teeth to scratch himself or rub against an object to satisfy his itch, but if you notice your dog is biting and licking his skin more than usual, you may have cause for concern.  Excessive biting and scratching at the skin can indicate potential health issues including:

  • Fleas and parasites
  • Allergies
  • Skin infections
  • Aches and pains
  • Psychological reasons

The severity of your dog’s symptoms will depend on the underlying cause but generally, the symptoms are mild to moderate in all cases and the cause easily treatable.

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Why Biting His Skin Occurs in Dogs

When your dog is biting at his skin, it is usually a reaction to irritation, such as fleas or possible allergies though sometimes if your dog is suffering from a psychological reason he may bite at his skin.  

Fleas and Other Parasites

One of the most common reasons for your dog to bite and scratch at his skin is a flea infestation.  Fleas are tiny parasites that bite and feed off your dog’s blood.  A flea bite on your dog’s skin will appear as a small, raised red bump and may become larger and inflamed if your dog scratches at the area.  If left untreated, a flea infestation can lead to tapeworms if your dog ingests any larva while biting at his skin.  In younger or smaller dogs, anemia can occur with heavy infestations. Prolonged infestation will also lead to flea allergy dermatitis, characterized by severe itching, constant licking and scratching, loss of hair, and scab formations.


Allergens in the environment can cause your dog to develop dermatitis, which may result as itchy, flaking skin on your dog. Allergies are a common cause of excessive biting and scratching at the skin and usually develop early in your dog’s life.  Certain breeds are also known to be more sensitive to allergens, such as Terriers, Setters, Beagles, and Retrievers.  

Skin Infections

Bacterial infections may occur in your dog if excessive scratching and biting of the skin are left untreated. A flea infection or allergic reaction that causes your dog to scratch at his skin may become an open wound due to scratching activity and then susceptible to bacterial infection.  A bacterial infection will cause your dog to further bite and scratch himself for relief and must be addressed to prevent further complications.

Aches and Pains

Sometimes foreign objects, such as glass or a burr, may become lodged in your dog’s paws or coat causing your dog to bite at the site.  A scratch from an object may also irritate your dog’s skin and cause him to bite, scratch, or lick the area. As your dog ages, he may develop arthritis, which will cause him to lick and possibly bite at his joints. Regular aches and pains should always be investigated to determine the cause and prevent additional pain in your dog.

Psychological Reasons

If a medical condition is not suspected, your dog may be licking or biting at his skin for an emotional or psychological reason such as boredom, phobias, anxiety, or stress. If not addressed and corrected, excessive licking and biting of the skin can turn into an obsessive behavior.  Your veterinarian, as well as a dog trainer, can help you develop a program to train and correct this type of behavior.

What to do if your Dog is Biting His Skin

Excessive biting, licking, or scratching the skin should alert you to a potential health condition. Before making an appointment with your veterinarian, look for signs of a foreign object in your dog's paws or fur.  Many times a burr or thorn may be lodged in your dog's paw or stuck in his coat.  Remove the object with care and inspect the area for any open wounds or reddening of your dog's skin.  Open wounds should be examined and treated by your veterinarian to prevent bacterial infection.   

A flea infestation is easy to spot in your dog, especially if he has a lighter coat because fleas are highly mobile parasites and that are dark in color.  Fleas also leave behind "flea dirt", which is reddish-brown fecal matter.  A flea infestation on your dog can quickly become an infestation in your home, and immediate action is necessary to treat and prevent further instances. You will want to talk to your vet to determine the best course of action, which may include prescription flea medication, over-the-counter medications, shampoo, or a combination of treatments. Following your veterinarian's strict instructions for flea control is important.  Never use your dog's medications on your cats or other animals because your dog's flea medications can reach toxic levels in cats and other small animals.  Be sure to alert your vet to the other animals in your home to get additional care and instruction for them.

If your dog is biting or scratching his skin due to allergies, your veterinarian will conduct a full physical examination to rule out other possible conditions before ordering allergy testing to determine potential allergens affecting your dog.  The most common form of allergy testing is an intradermal test or a "patch" test where small needles will inject an allergen just under your dog's skin.  This test is usually performed on the abdomen, which will need to be shaved.  Your vet may also order a serum test to sample your dog's blood and determine the allergen's affecting him.   

Treatment of allergies will depend on the allergen, and though there is no cure for allergies, you can help reduce your dog's reactions over time by removing the allergen from the environment.  If your dog's reaction is food based, your veterinarian will suggest a new diet that will support your dog's health.

Prevention of Biting His Skin

Proper flea control can prevent excessive biting, scratching, and licking of the skin.  If you live in more humid climates and your dog plays outside you will want a preventative flea control solution that stops the fleas before they can get out of hand.  Your veterinarian can help you develop a flea control solution to prevent infestations.  

Complicated health conditions, such as dermatitis and bacterial infections can be avoided by determining the cause of your dog’s itchy skin and treating it immediately.  To prevent aches and pains resulting from foreign objects, always inspect the area your dog is biting.  Burrs and thorns can be very uncomfortable when stepped on or caught in your dog's coat.  Never attempt to remove objects such as glass or metal from your dog's body and seek immediate medical attention in these instances.  Removing the object on your own can leave behind broken pieces and possibly lead to infection. 

Providing your dog with a safe, clean environment is important in preventing many conditions that cause your dog to be itchy.  Remove identified allergens from your home and prevent your dog from coming into contact with allergens he reacts to outside.  You may not be able to remove 100% of the allergens affecting your dog so bathing him with hypoallergenic shampoo may bring him relief and prevent itchy skin.

Cost of Biting His Skin

Treatment cost for your dog’s excessive biting, licking, and scratching of his skin will depend on the underlying cause.  For example, the average cost for treating flea and flea related conditions is around $350 whereas if your dog is experiencing allergy-related dermatitis, the average cost is around $1,200.

Biting His Skin Questions and Advice from Veterinary Professionals

English Setter Mix
2 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms

Chewing Tail
Biting skin
Ear Itching

Arthur has been chewing at his skin, particularly on his tail and hip, and seems very restless or anxious. He also has had an increase in the amount of ear scratching he wants, often rubbing his head against my leg until I scratch behind his ears. His biting/chewing/itching is not making him bleed or have prolonged red skin under the fur, but it seems to be increasing over the past week and a half. The chewing and restlessness seem to get worse when anyone from the family is not home, and he spends a lot of time crying by the front door and I can't calm him down. He recently switched to a new (and better!) food, and we did it slowly so he didn't get any digestive issues, but otherwise there haven't been any changes. I'm home most of the time, and we have two other dogs that are always with him, but I'm concerned that these issues are much worse when I have to crate them all and go to the store. I don't know if this is related to physical health or if it's a psychological issue, but I'm starting to get worried.

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2 Years
Moderate condition
0 found helpful
Moderate condition

Has Symptoms


My dog will get red spots about the size of a dime, but I can never tell if they’re there prior or if it’s a result of her chewing and licking at her skin. They primarily occur on her stomach. Her stomach itself will give off a pinkish color sometimes. The problem is that it isn’t always constant. It will come for a few days, go away for a week or so, and then come back.

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German shepherd mix
4 Years
Serious condition
0 found helpful
Serious condition

Has Symptoms


My dog is biting and licking his skin and also using random objects to rub/scratch his skin. He will scratch his skin with his teeth until it begins to bleed, but as soon as it begins the healing process he will start scratching it again. While he is scratching himself with his teeth, he takes out his fur and it never grows back due to his continuous scratching. We have tried different types of shampoo and treats with vitamins to help him but nothing seems to work. He will whine and whine, trying to tell me he’s hurting but I don’t know what to do about it. As I am not able to afford a vet visit at the moment.

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1 Year
Moderate condition
0 found helpful
Moderate condition

Has Symptoms

Itching Skin
Compulsive licking

Medication Used

Hydrocortisone/ Oatmeal 1% Spray

Fairly anxious, has calmed down a lot since passing his Obedience 1 training, but gets very fixated on chewing aggressively on certain spots: thighs, tail/ butt, and lower back areas. He bites and chews until he draws blood or creates mini sores. He also licks his belly (there's not a lot of fur there) and licks/ gnaws to the point of getting little blood bubble.

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Miniature Schnauzer
11 Years
Mild condition
1 found helpful
Mild condition

Has Symptoms

Constant licking & biting near butt

My dog has been biting and licking a lot near his butt. At first, I thought it was his glands that were bothering him, but then I saw a couple red bumps. He’s also been licking and biting around on his back legs. I gave him a bath while using a flea shampoo, I combed through his hair and made sure I checked everywhere. Even after I gave him a back it still seems like something is bothering him & he keeps biting and licking in the same spot. Does he still have fleas or is it just the bites that are bothering him?

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
3320 Recommendations
It is possible that the area is still a little sensitive from any bites or irritation before the bath, however there are many possible cause for this itching including fleas, mites, infection (pyoderma), anal gland issues among other causes. Try to prevent Harley from licking and biting the area (a cone may help) and monitor for improvement, if there is no improvement you should visit your Veterinarian for an examination. Regards Dr Callum Turner DVM

Thank you!

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