Why does my dog lick so much?

Allergies are the most common cause of paw licking (VCA). Itch can also come from fleas or ticks, and once the skin is broken, bacteria, fungi or yeast move in and make it itchier still (VCA). Owners often do not realise that licking is itch, because the dog never scratches (Merck).

Check the paws for:

• Red or pink skin between the toes or pads.
• Wet, brown or rust-stained fur.
• A yeasty smell, swelling or a cut, thorn or broken nail.

Regular grooming helps you spot these early; our grooming cost estimator prices it.

The two main allergies behind itchy licking behave differently.

Yes, and it is easy to miss. A review of referred behaviour cases put a conservative estimate of around a third as involving some painful condition, and noted that repetitive licking or chewing of the wrist or tail may arise from pain (Animals). Joint pain is also one of the physical causes of lick granulomas (VCA). If your dog licks one leg and is stiff, slow on stairs or reluctant to jump, mention both to your vet.

• Nausea. Before vomiting, a dog may be restless, lick its lips, drool and swallow repeatedly (VCA).
• Stress or emotional cues. In one study, dogs licked their mouths more when looking at negative facial expressions, and more towards human faces (Behav Processes).
• Compulsive behaviour. Air snapping is one of the recognised compulsive behaviours (VCA).

Frequent air licking with drooling or a poor appetite is worth a vet visit.

Excessive licking of surfaces has been linked with gut disorders. In a study reviewed in the journal Animals, 59% of dogs improved greatly within 3 months of treatment for their gut condition (Animals). Some dogs with no gut diagnosis improved on diet and stomach medicines too, which suggests nausea or acid discomfort can drive it (Animals). If your dog has started licking floors, walls or carpet, a gut check comes before behaviour training.

Licking people is mostly social. VCA describes licking as normal and a sign of affection, notes that it promotes endorphin release, and says dogs explore with taste (VCA). Salty skin, lotion and food smells all help.

If you would rather not be licked, turn away calmly and reward a sit or a toy instead. Constant licking of people can be anxiety, so look at the rest of the dog's body language; our guide to separation anxiety covers licking when left alone.

Licking is normal grooming until it is repeated often enough to disrupt the dog's routine, or a dog keeps licking a paw after it has become sore (VCA). Merck gives incessant licking as an example of a compulsive disorder (Merck). Painful, nerve and skin conditions can look the same, so a vet check comes first (VCA).

• Give daily exercise, social time, reward-based training and food puzzles.
• Interrupt calmly and offer something else to do, then reward it.
• Never scold: punishment increases fear and frustration (VCA).

A lick granuloma forms when a dog obsessively licks one area, setting up a cycle of self-trauma, inflammation and infection. The top and outside of the front legs, typically the wrist, are most often affected (VCA). It shows as raised, thickened, ulcerated skin (Vet Clin North Am).

• Causes can be physical, such as allergies, infection or joint pain, and psychological, such as fear, anxiety or compulsive disorder (VCA).
• It is seen mainly in medium to large breeds, including Dobermans, Great Danes, Labradors, Weimaraners, Golden Retrievers and Boxers (VCA).
• Not every sore is what it looks like: in six dogs, the causes of granuloma-like sores included tumours, deep infection and an orthopaedic pin (JAAHA).

Treatment targets the cause, any infection and the behaviour together (Vet Clin North Am). Most cases can be treated successfully, though it can relapse (VCA).

1. Find out where and when the licking happens, and treat the cause with your vet.
2. Keep flea and tick treatment up to date.
3. Wipe and dry paws after wet or muddy walks and check between the toes.
4. Add exercise, chews and puzzle feeders, and reward calm behaviour.
5. Ask your vet about a protective collar or sleeve if a sore will not heal.

If your dog eats grass and licks its lips too, our guide to why dogs eat grass covers nausea and grazing.

See your vet if licking is constant, aimed at the paws or one spot, or has caused hair loss, red skin or a sore (VCA, VCA). Go the same day if licking comes with vomiting, diarrhoea, lethargy or not eating (VCA). For other changes, the dog behaviour checker hub covers the rest of the cluster.

Every figure and threshold on this page comes from the veterinary sources below, and each one is linked where it is used. Where no source gives a cut-off, we say call your vet rather than invent one.