Why does my dog chase his tail?

3 min read Updated on October 8, 2026

In shortIn puppies, tail chasing is usually play: he is discovering his own body. In adults, a few spins now and then are harmless, often out of boredom or because it makes the whole family laugh. It becomes a problem when it is frequent, long, hard to interrupt, or when he hurts himself: an itch, pain or a compulsive disorder may be behind it. In that case, start with the vet.

What it often means

Play, especially in puppies: he discovers that the thing moving behind him belongs to him, and it is hilarious.
Boredom or excess energy: with nothing else to do, he invents a game, often in the evening or after a long wait.
Attention: if people laugh, call out or film while cheering him on every time, he learns that it works.
Discomfort: fleas, irritated skin, full anal glands, an injury or pain at the base of the tail make him turn around to nibble at his rear end.
A compulsive disorder: a 2012 study found that compulsive tail chasing is more common in puppies separated early from their mother and in fearful dogs.

Signals to read at the same time

Duration and frequency: a few spins that end in play, or whole minutes, several times a day.
His response when you call: a playing dog stops and comes; a dog stuck in a loop seems elsewhere and starts again as soon as you let go.
His tail and rear end: missing hair, wounds, redness, targeted nibbling at the base of the tail, scooting on the floor.
The trigger: excitement, waiting, visitors, a noise, or nothing you can spot. A recurring trigger helps the vet and the behaviorist.
His other behaviors: constant paw licking, chasing shadows or reflections, snapping at invisible flies can belong to the same picture.

What you can do

Do not laugh or egg him on: a dog quickly learns what entertains his audience. If you film it for the vet, do it quietly.
Interrupt calmly: call him, ask for a simple behavior he knows, then reward him and offer something else to do, a chew or a walk.
Enrich his days: sniff walks, find-it games, food-stuffed toys, chewing. Boredom feeds the loop.
Check his tail and rear end for fleas, small wounds, redness or a strong smell, and review his flea prevention with your vet.
Never punish him: stress makes compulsive behaviors worse, and punishment does not remove the cause.

When to see a vet

See a vet if episodes are frequent, long or hard to interrupt, if he catches and bites his tail, if it bleeds or loses hair, if he licks his rear end, or if it starts suddenly in an adult. A dog who seems absent during an episode should also be seen: a neurological cause is possible. The vet rules out pain, skin and anal gland problems first; if the behavior is compulsive, a veterinary behaviorist or certified behavior consultant takes over.

Frequently asked questions

Is it normal in puppies?

Yes, a few happy chases are part of discovering his body, and they fade as he grows. Just make sure it does not become his only way to calm down or keep busy: play, chewing and naps should take over.

Do some breeds do it more?

Yes. Compulsive tail chasing is more often described in bull terriers and German shepherds, and in a few other breeds. Not every dog of these breeds will do it, but in them, a behavior that turns repetitive deserves to be taken seriously early.

He catches his tail and bites it until it bleeds. What should I do?

Interrupt him calmly, without yelling, and get him to the vet soon: the wound needs care, and the cause needs finding. Meanwhile, avoid the situations that set off episodes and keep him busy before they start. Do not put a bandage or any product on it without your vet’s advice: he may tear it off or swallow it.

Is it boredom or a compulsive disorder?

Boredom gives a few spins that stop as soon as there is something better to do. A compulsive disorder shows in the repetition, how hard it is to interrupt and the room it takes: he spins instead of eating, playing or sleeping. Film several episodes: duration and context help the vet decide.

Sources

The studies this page relies on, with a link to the original publication.

Tiira et al. (2012). Environmental effects on compulsive tail chasing in dogs. PLoS ONE.Compulsive tail chasing is more common in puppies separated early from their mother and in fearful dogs, and less common in dogs given vitamin and mineral supplements.

Mimo reads behavior. It does not replace a vet.