Pet Health
· Updated March 02, 2026· 8 min read

Why Does My Dog Keep Chewing His Butt and Tail

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Dr. Chandler Bruening
Written by Dr. Chandler Bruening, DVMVeterinarian & Contributing Writer
Last medically reviewed: March 02, 2026
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- A dog that keeps biting or chewing at their butt and tail is almost always responding to physical discomfort — this is not normal behavior and should not be dismissed as a quirky habit
- The most common causes are anal gland problems (impacted or infected glands causing pressure and itching), skin allergies (food or environmental triggers causing irritation around the rear), parasites (fleas, ticks, or mites causing inflammation), and general skin irritation
- Persistent chewing and licking can break the skin, creating open wounds that are vulnerable to secondary bacterial infection — addressing the behavior early prevents this escalation
- Behavioral factors like stress, anxiety, and boredom can also drive compulsive licking and chewing, but physical causes should always be ruled out first through a veterinary exam
- Prevention focuses on supporting anal gland health through firm stool and adequate fiber, staying current on parasite prevention, maintaining regular grooming, and addressing allergies with your vet

WRITTEN BY DR. CHANDLER BRUENING, DVM

Does your furry friend have an unusual fixation with their backside? My dog keeps biting his bum and tail…ring any bells? If your dog keeps licking and biting his bum, you’re probably looking for ways to keep the behaviors at bay.

Understanding the behavior: why dogs chew their butt and tail

Dogs are known for their quirky behaviors, and chewing at their rear end is just one of those behaviors we come to expect as “a dog being a dog.” But a dog biting their butt isn’t ‘normal’––several factors could be contributing to this behavior, ranging from physical discomfort to psychological stressors. 

Why is my dog biting his butt? If your usually relaxed dog keeps biting butt or tail areas, one of these triggers could be to blame:

Anal gland issues

My dog keeps licking and biting his bum––what’s the deal? First up on the list of potential culprits are anal gland issues. Dogs have small sacs located on either side of the anus that produce a smelly substance. Sometimes, these glands can become blocked or infected, causing discomfort and itching that may make your dog chew or lick their rear end in an attempt to alleviate the irritation.

Skin allergies

Another common cause of butt-chewing behavior in dogs is skin allergies. Just like humans, dogs can be allergic to various environmental triggers like pollen, dust mites, or certain foods. Allergic reactions can lead to intense itching and irritation–even in the anal glands– prompting your dog to obsessively lick and chew at their bum and tail area. 

Skin allergies can often be difficult to diagnose and treat, so have your pet evaluated by your veterinarian as soon as possible to determine how to best provide relief.

Parasites

The reality of parasites isn’t pleasant, but they’re common for many dogs. Fleas, ticks, and mites can cause significant discomfort for our canine companions. Even if you can’t see them, these tiny pests can wreak havoc on your dog's skin, triggering intense itching. In fact, oftentimes you won’t see the fleas causing the itch! Similar to a human getting bit by a mosquito or fire ant, the bug will go unnoticed until the itch is unbearable. 

Your dog’s response to inflammation might look like butt-chewing behavior in an attempt to relieve the irritation caused by these unwelcome guests.

Skin irritation

Sometimes, the explanation for butt-chewing behavior is as simple as skin irritation. Rough play, anal gland issues, contact with irritants, or dry skin can all lead to discomfort for your pup. Just like us, dogs may try to alleviate the itchiness by chewing or licking at the affected area.

Behavioral factors

Last but not least, let's not overlook the role of behavioral factors in butt-chewing behavior. Dogs, like humans, can develop compulsive behaviors for a variety of reasons: stress, anxiety, boredom, or even habituation can lead to excessive grooming and chewing behaviors. If your dog is feeling anxious or stressed, they may resort to self-soothing behaviors like chewing on their tail or licking their rear end. 

Regardless of the cause of itch, it’s important to have your pet examined by a veterinarian before the itching leads to broken skin, which can then lead to skin infection (if not already present).

Health Implications of excessive butt & tail chewing

While the occasional butt-chewing or a dog biting the tail area isn’t widely recognized as a red flag, persistent licking and biting can have serious health implications for your furry friend. Constant chewing and licking can break the skin, leading to open wounds and potential infections. 

If left untreated, underlying health issues–like anal gland infections or skin allergies–can worsen over time, impacting your dog's overall well-being.

Home care & prevention strategies

Now that we understand some of the reasons behind that strange butt-chewing behavior, let’s explore some strategies to address and prevent it at home:

  • Healthy diet: A balanced diet that’s rich in essential nutrients can support your dog's overall skin health and reduce the likelihood of allergic reactions.
  • Parasite prevention: Stay vigilant with flea and tick prevention methods to protect your dog from pesky parasites.
  • Environmental enrichment: Providing mental and physical stimulation through toys, social play, and activities can help alleviate your pup’s boredom and reduce stress-related behaviors. 

By implementing these preventive measures, you can help minimize the likelihood of your dog resorting to chewing and licking their butt and tail.

When to seek professional help

My dog keeps biting his bum and tail––but is it actually that serious? 

If your dog's butt-chewing behavior persists despite your best efforts, it's time to consult with a veterinarian. A thorough examination can help identify any underlying health issues contributing to the behavior. Your vet may recommend treatments such as medicated shampoos, dietary changes, or medications to alleviate discomfort and manage any underlying conditions. Additionally, a certified animal behaviorist can provide valuable insights and guidance to address any behavioral issues contributing to your dog's butt-chewing habits.

In conclusion, a dog biting butt or tail areas may seem like a puzzling behavior, but with patience and understanding, you can help your furry friend find relief and comfort. By addressing any underlying health issues, implementing preventive measures, and seeking professional guidance when needed, you can ensure that your dog's rear end remains happy and healthy for years to come.

Still looking for answers about your dog’s rear-end health?

Why Do Dogs Scoot Their Butts?

What to Do If Your Dog Is Bleeding from the Butt

7 Foods to Help Dogs Express Anal Glands Naturally

 

This blog exists to provide general information and education about veterinary health and related subjects. The information and other content provided in this blog, website, or in any linked materials is not intended as and should not be considered, or used as a substitute for, medical advice, diagnosis, or treatment. We cannot diagnose conditions, provide second opinions, or make specific treatment recommendations through this blog or website.

If you suspect that your pet has a medical concern, you should consult with your veterinary health care provider or seek other professional medical treatment immediately. Never disregard professional medical advice or delay in seeking it because of something that you have read on this blog, website, or in any linked materials.

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DR. CHANDLER BRUENING SAYS
"A dog biting their butt is not just a quirky habit. It is almost always a response to physical discomfort — anal gland problems, allergies, parasites, or skin irritation. The key is identifying which one so you can address the cause, not just the behavior."
— Dr. Chandler Bruening, DVM , General Practice

Frequently Asked Questions

Why does my dog keep biting his bum and tail?

The most common causes are anal gland problems (impacted or infected glands causing itching and pressure), skin allergies (food or environmental triggers causing irritation), parasites (fleas, ticks, or mites), and general skin irritation from dryness or contact with irritants. Behavioral factors like stress or boredom can also contribute but are less common than physical causes. A veterinary exam is the best way to identify the specific trigger.

Is it normal for dogs to chew their butt?

Occasional grooming of the rear area is normal. However, persistent, repeated biting or chewing at the butt and tail is not normal and indicates discomfort. If your dog is returning to this behavior frequently, fixating on the area, or causing redness, hair loss, or broken skin, something is causing irritation that needs to be addressed.

Can anal gland problems cause a dog to chew their butt?

Yes. Anal gland problems are one of the most common reasons dogs chew at their rear end. When the anal glands become impacted or infected, they cause pressure, itching, and discomfort around the anus. Dogs respond by chewing, licking, or scooting to try to relieve the irritation. If you notice butt-chewing along with scooting, a fishy smell, or swelling near the anus, anal glands are a likely cause.

How do I stop my dog from chewing his butt?

The most effective approach is identifying and treating the underlying cause. If the cause is anal gland issues, supporting firm stool through fiber supplementation helps the glands empty naturally. If allergies are the trigger, work with your vet on allergy management. If parasites are involved, ensure your dog is current on flea and tick prevention. Keeping the area clean and the coat well-groomed also helps reduce irritation.

When should I take my dog to the vet for butt chewing?

See your vet if the chewing is persistent and does not stop within a day or two, if you notice broken skin, redness, swelling, or hair loss around the rear, if there is blood or discharge near the anus, if your dog is also scooting or has a foul smell from the rear, or if the behavior started suddenly with no obvious trigger. Early evaluation prevents minor issues from escalating to infections or wounds.

Can stress cause a dog to chew their butt?

Yes. Stress, anxiety, and boredom can lead to compulsive grooming behaviors including excessive licking and chewing at the rear. However, physical causes such as anal gland problems, allergies, and parasites are more common and should be ruled out first through a veterinary examination before attributing the behavior to stress alone.

Sources

Merck Veterinary Manual — Anal Sac Disease in Dogs
https://www.merckvetmanual.com/dog-owners/digestive-disorders-of-dogs/anal-sac-disease-in-dogsMerck Veterinary Manual — Itching (Pruritus) in Dogs

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Veterinary Disclaimer

Vetnique Labs was founded by Dr. James Bascharon, DVM, and all content is reviewed by our Vet Advisory Board. This information is not a substitute for professional veterinary advice. Always consult your veterinarian.

Dr. Chandler Bruening
About the Author

Dr. Chandler Bruening, DVM

Veterinarian & Contributing Writer

Dr. Chandler Bruening is a small animal veterinarian at Palmetto Animal Hospital in Florence, SC. She has a soft spot for senior "grey-muzzled" patients and has been recommending Vetnique products to clients for years.

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