If you've ever noticed your cat or dog licking around the tail and wondered about the behavior, you're not alone. Dogs and cats commonly lick under or around their tails for a variety of reasons.
Anal Gland Disease
Anal gland disease is one of the most common reasons a dog will lick under the tail. Dogs and cats have two anal glands (also called anal sacs) on each side of the anal opening. These can become impacted or infected. If they do, the pet will often lick the area to try to relieve the pressure in the glands. Some dogs will also 'scoot' along the floor when they have an anal gland problem.
Reproductive Disease or Discharges
Female animals will often lick the vulvar area when they are in heat. They will also lick the area if they have a uterine infection (pyometra). Some female animals develop vaginitis, which can cause severe itching. A female may also lick her vulva is when she is in the process of giving birth.
Fleas
Fleas bites are common at the base of the tail, where the tail attaches to the body. Cats and dogs with fleas may lick or chew at that site.
Parasites
On occasion, a pet will lick the anal area if infected with intestinal worms. However, most animals with worms do not show this behavior.
Normal Grooming
Dogs and cats may lick under or around the tail as a normal grooming process. If you see your pet is licking excessively, however, it is probably a sign of a medical problem and you should contact your veterinarian.