Is your dog losing hair on their tail? You might be curious if it is just falling out, a result of your dog chewing hair off their tail, or another larger health concern. Your dog's itchiness and red skin could be caused by an allergy, fleas, hormones, some kind of behavioral disorder, or in rare cases, a food allergy.

While the exact cause of a dog losing tail hair cannot be determined without the assistance of your veterinarian, there are clues to notice at home beforehand that can be valuable information for your vet.

Is Your Dog Chewing Hair Off Their Tail?

The most important thing to notice is whether your dog is chewing on their tail or not. A dog chewing hair off their tail will have rough, frizzy, and broken hair on the tail. The hair may also be wet with saliva. In addition, the skin on the tail will likely be red, inflamed and could have open sores from aggressive chewing.

If your dog is chewing, then it could be a flea allergy, especially during warmer months when fleas are more active. If your dog is allergic to fleas, just one bite can cause them to go crazy and chew their tail severely enough to create open sores. Flea allergy dermatitis is the number one cause of excessive tail chewing in dogs and may require flea treatment, antibiotics and/or steroids to stop the itching.

Other allergies can also result in tail chewing. A dog losing hair on their tail may be the result of a condition called atopy (environmental allergies) or food allergies. Dogs with these types of allergies may benefit from a therapeutic food and your veterinarian can provide this specific nutritional recommendation when needed.

Another reason a dog may be chewing their tail is because of anal gland issues. If you notice your dog licking and chewing their anus in conjunction with scooting, or if the anus looks swollen, then anal glands may be the problem. Treatment for anal gland issues could include anal gland expression, antibiotics, pain medication and possibly surgery if the anal gland is infected or abscessed. If your dog has repeated anal gland issues, your veterinarian may also recommend a therapeutic food. 

Another (gross) cause of tail chewing could be intestinal worms. Tapeworms coming out of the anus can be irritating and cause your dog to lick and chew the anal area. The most common symptom of tapeworms is seeing rice-grain-like organisms adhered to your dog's bum. Tapeworms require fleas for their life cycle, and dogs who have fleas can have tapeworms as well — double gross! If you or your vet suspect intestinal parasites, then deworming medication is indicated, and if tapeworms are suspected, flea control is in order, as well.

In some cases, dogs can chew the hair off their tails in response to pain. Conditions such as arthritis in the tail, a broken tail, a foreign body like a foxtail stuck in the tail's skin, or lower back pain can all result in excessive tail grooming. Emotional distress from anxiety or fear and behavioral disorders, such as compulsive tail-chasing, can also cause excessive tail chewing. Each of these conditions requires different treatment, so talk with your vet. If your dog is chewing their tail due to behavioral reasons, your vet may recommend a certified dog behaviorist to discuss how to help your dog.