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Why Do Dogs Bite Their Tails? 12 Vet-Reviewed Reasons

Written by: Brooke Billingsley

Last Updated on April 12, 2024 by Dogster Team

Adorable cute puppy Welsh Corgi Pembroke dog lying and biting its own tail

Why Do Dogs Bite Their Tails? 12 Vet-Reviewed Reasons


Dr. Ashley Darby Photo


Dr. Ashley Darby

BVSc (Veterinarian)

The information is current and up-to-date in accordance with the latest veterinarian research.

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Have you ever noticed your dog biting or chasing their tail? It can be very cute and funny to watch! Have you ever wondered why your dog is doing that, though? There are multiple reasons that dogs chase and bite their tails, and it’s important for you to consider the possibilities if your dog is doing it frequently.

While there are benign causes of this behavior, there are some medical and behavioral issues that can lead to your dog biting their tail.

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The 12 Reasons Your Dog May Bite Their Tail

1. Fleas and Ticks

One of the top reasons that dogs bite at their tail is because they have parasites on their skin, like fleas and ticks. Fleas and ticks can cause a great deal of discomfort and itchiness to your dog. Their movement can be irritating to the skin, and when they bite, it can be itchy or painful.

It’s not uncommon for fleas, in particular, to congregate at the base of the tail, leading to excessive chewing in this area. In dogs with severe flea infestations or flea allergies, it’s very common for them to chew at the base of the tail so frequently that they experience significant hair loss. Flea and tick medications from your vet can help treat and prevent this problem.

brown dog is biting his tail
Image Credit: KPhrom, Shutterstock

2. Intestinal Parasites

Intestinal parasites, like tapeworms and roundworms, are not uncommon in dogs. Tapeworms are one of the most common intestinal parasites in dogs, and they’re acquired when a dog eats an infected flea or raw meat. This means that if your dog encounters even one infected flea and accidentally swallows it, they can become infected with tapeworms.

Intestinal parasites can cause irritation and discomfort to the rectum, leading to excessive licking and chewing. Some dogs may bite back at their tail when experiencing a sudden onset of discomfort, while other dogs may simply begin to excessively lick and bite at the area around their rectum.

Intestinal parasites can typically be controlled with medications from your pet shop or vet.

3. Skin Infections

Dogs can develop primary and secondary skin infections. Primary infections are caused by direct contact with an infectious agent, like scabies mites, while secondary infections are caused by an issue related to another problem. For example, a bacterial skin infection that occurs from your dog chewing their skin too much due to allergies would be considered a secondary infection.

Skin infections can be painful, itchy, and irritating to dogs, leading to excessive licking and chewing. Hot spots are a common skin problem in dogs, and they are accompanied by obsessive licking and chewing. Your dog may bite, chew, or excessively lick their tail if there is a skin infection present.

The treatment of skin infections is dependent on the cause of the infection, which will require evaluation by your vet.

Labrador dog biting his
Image Credit: PixieMe, Shutterstock

4. Allergies

There are many things that can cause allergic reactions in dogs, including foods, grasses, pollen, and even fleas. Dogs that are allergic to fleas can experience a complete allergy flare-up from one flea bite. Continued exposure to allergens may cause the allergies to worsen over time.

Itchy and tender skin are common problems in dogs with allergies of any kind, so dogs with allergies can often be spotted licking and chewing at their tail, back end, and other areas of irritation (paws, muzzle, and abdomen are common spots).

The treatment of allergies in dogs is dependent on the cause of the allergic reaction. Allergy treatment may require prescription food, routine injections, daily medications, and flea treatments from the vet.

5. Anxiety

If you’re familiar with cats, then you know that stressed cats may take on the habit of obsessively overgrooming themselves, to the point of hair loss. Although this is less common in dogs, anxious dogs may lick and chew themselves obsessively. This is commonly seen on the paws and front legs, but some dogs may choose to let their stress out by licking and chewing at their tail and back end.

To deal with this issue, you need to identify the source of your dog’s stress and work to relieve it. In some cases, anti-anxiety medications from your vet may be required to manage stress-related chewing.

Fox terrier puppy dirtying its own tail lying on the bed
Image Credit: Ermolaeva Olga 84, Shutterstock

6. Boredom

Bored dogs may become destructive or noisy. However, some dogs may internalize their boredom, instead focusing on licking or chewing at themselves. Bored dogs may begin to chew at their tail or back end, especially if they’re spending long periods of time in a kennel or another enclosed space lacking enrichment.

7. Obsessive Compulsive Disorder

Obsessive-compulsive disorders do occur in dogs. These can be severe to the point that a dog will hurt themselves when tail biting is involved. These dogs will typically have other behavioral issues such as anxiety, phobias, and sometimes aggression.

It can actually be a syndrome in certain breeds such as Bull Terriers, German Shepherds, and Staffordshire Bull Terriers. These dogs will usually need medication and behavioral modification to manage the behavior.

man walking his Staffordshire Bull Terrier dog with retractable leash
Image Credit: Christine Bird, Shutterstock

8. Cognitive Decline

As dogs age, sometimes their cognitive abilities will reduce, even to the point of cognitive dysfunction or doggy dementia. These dogs engage in repetitive behaviors which may include tail chasing. Other signs include disorientation, forgetting known commands, star gazing, barking at nothing, and getting lost in the house.

9. Pain

A common cause of licking and chewing that is often overlooked by people is pain. Dogs with arthritis, for example, are known to lick at their arthritic areas in an attempt to relieve some of their discomfort. If you’ve ever had a dog that had surgery, then you know that many dogs will lick at their surgical sites, also in an attempt to relieve some discomfort.

If your dog is experiencing arthritis in their spine and hips, or if they’ve acquired a tail, hip, or rectal injury, then they may begin to excessively lick and chew at their tail. If you’ve noticed your dog beginning to do this, you should attempt to determine if they may be experiencing pain or discomfort at the site they’re licking.

beagle dog sick sad on bed
Image Credit: Iryna Imago, Shutterstock

10. Anal Gland Problems

Dogs have two anal sacs located on both sides of their rectum that fill with excretions from their anal glands within the sacs. Usually, these sacs are emptied whenever your dog poops. However, anal glands can become overly full or even impacted. This occurs when they are not emptying properly, which allows the secretions to become too thickened to pass. This can be very irritating to your dog, leading to them licking at their back end a lot. In some cases, anal glands can become infected, even leading to an abscess which can rupture.

These are not uncommon problems for many dogs, and some dogs require manual expression of the anal glands to keep them from becoming impacted. Anal gland problems are usually accompanied by a fishy, unpleasant scent coming from the back end.

If you suspect your dog is experiencing problems with their anal glands, then it’s best to talk to your vet to determine the necessary next steps. While most anal gland problems are taken care of easily, more serious problems may require significant medical interventions.

11. Attention Seeking

When you see your dog chasing their tail, do you react in a way that shows you’re entertained or pleased? Does it cause you to immediately start paying attention to your dog? If this is the case, then your dog may continue the behavior whenever they’re seeking your attention.

Dogs are intelligent animals that will learn through positive reinforcement that when they chase or catch their tail, you will stop what you’re doing and pay attention. Although cute, this isn’t ideal since it may be frustrating for your dog if you start to ignore the behavior.

Beautiful golden retriever puppy biting tail in garden
Image Credit: Donna White, Shutterstock

12. Fun

The good news is that some dogs chase and bite their tail simply because it’s fun for them. It’s a pretty common behavior, especially in puppies. Like human babies, puppies explore the world around them by putting things in their mouths. Chasing, and sometimes catching, their tail can serve as part of them understanding their own body and how it interacts with the world.

Some dogs may never outgrow this silly behavior, and as long as their needs are met, the behavior doesn’t impact their quality of life and they are not doing any damage to their skin, coat, or tail, then there’s nothing wrong with it.

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Tail chasing and biting can be funny, but it’s important for you to recognize when this behavior is not being done for fun. All of the causes mentioned that are related to medical or behavioral issues are treatable with proper care. Some may require the assistance of your vet, while others may require the assistance of a professional veterinary behaviorist or experienced trainer to remedy.

Featured Image Credit: BONDART PHOTOGRAPHY, Shutterstock

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