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Why are both my dogs itching their butts and tails with black crusts?

Updated On September 23rd, 2025

Pet's info: Dog | Akita | Male | neutered | 105 lbs

Both of my dogs itch a lot by there butt and tail and I just noticed the one has chewed on his tail too the point it is raw but there is a bunch of black crusty stuff on his tail

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2 Answers

Most Helpful Answer

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Answered By Lauren Celestin, DVM

Veterinarian, Veterinary Dentistry Resident

Published on August 17th, 2017

Hi there! The base of the tail area is a common hiding place for fleas. Unfortunately the picture of the black crusts is a bit blurry, but fleas usually leave what we call "flea dirt" (its really flea poop!) in the hair. It can appear like black crusts. If Major is not on a flea and tick preventative, I highly recommend getting him started on one. Many dogs have allergies to fleas and the vicious cycle of biting, scratching and chewing starts until they have caused a wound or sore. There are definitely other possibilities other than fleas, but your description and the fact that both dogs are experiencing the same signs is suspicious for a fleas. It is important that Major, does not continue to chew his tail as it looks like he has already made a good start on giving himself a hotspot. I would highly recommend having both dogs, especially Major since he already has a sore, evaluated by a veterinarian to rule out other possible dermatologic problems. Treating for fleas is an easy place to start and you can do that with out a trip to the vet. I hope this information was helpful and your pups get some relief soon!

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    Answered By Dr. Macartney, BVet Med, MRCVS

    Veterinarian

    Published on

    I am so sorry to hear that Major is having such a hard time with his skin it appears to be a case of moist dermatitis or "hot spot". Hot spots can be very difficult to heal, and take a long time. This is caused by a Dog biting or licking their skin when it is itchy. Fleas are the most likely cause. Though allergies can also cause this. The keys to a successful healing process are; A clipped area around the sore Cleaning the sore with a vet prescribed antiseptic Leaving the sore open to dry out (as the moisture promotes bacterial growth) Antibacterial/ hydrocortisone spray prescribed from the vet for healing An e-collar to prevent Major from scratching or biting at the hot spot and making it worse Measure the hot spot with a ruler, and compare in a few days time to make sure that it is reducing in size. If you feel like Major is not healing well, I would suggest a trip to the vet for the above medications or call and discuss the possibility for a prescription. Oral antibiotics and/ or a steroid injection may help to jumpstart the healing process. I know hot spots can be very frustrating for you as a pet parent and for Major. I sincerely hope it starts to heal soon. Warmest regards to you both.

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