Common Skin Problems in Dogs and How to Spot Them

Why Dog Skin Problems Are So Common

A dog's skin is surprisingly delicate. Compared with human skin, the outer layer is far thinner — often only a few cell layers deep — so irritants, allergens and bacteria get through much more easily. Add a warm, dense coat that traps moisture, and you have perfect conditions for flare-ups.

In the UK, most itching we see in practice comes down to one of four things: parasites, allergies, infections, or a mixture of all three. The frustrating part is that they all look fairly similar in the early stages. A dog scratching at teatime could have fleas, a pollen allergy, a yeast overgrowth or a food sensitivity — and quite often more than one at once. That is why spotting the pattern matters as much as spotting the symptom.

Itching, Scratching and Redness

Every dog scratches occasionally. What should catch your eye is scratching that has become a habit — the sort that interrupts naps, wakes you at 3am, or carries on while your dog is eating.

Pay close attention to where the itching is centred. Fleas tend to favour the lower back and tail base. Environmental allergies usually show up on the face, ears, paws, armpits and groin. Food sensitivities are often far less predictable.

Look for these early warning signs:

• Skin that looks pink, warm or angry, especially in the armpits and groin
• Rusty brown saliva staining on white or pale coats, caused by constant licking
• Small scabs, crusts or grazes where claws have caught the skin
• A damp, musty or yeasty smell — often a sign that infection has moved in
• Thickened, leathery skin in areas that have been scratched for weeks

Redness and warmth usually mean inflammation is active. If the skin is also broken, bacteria have an open door.

Hair Loss, Bald Patches and Coat Changes

Some shedding is normal, particularly in spring and autumn. Genuine hair loss looks different — you will see skin where fur used to be, or a coat that has become thin, dull or greasy.

Patchy loss with broken hairs, crusting or redness often points to infection, mites or intense scratching. Symmetrical thinning down both flanks, a dull coat and a pot-bellied appearance can occasionally signal a hormonal problem such as an underactive thyroid, which needs blood tests to confirm.

Also check for thinning around the eyes, muzzle and ears, and for dandruff that appears suddenly in a dog who previously had a glossy coat. Any hair loss that spreads over a week or two is worth a vet visit rather than a wait-and-see approach.

Repeated Paw Licking and Chewing

Paw licking is one of the most overlooked signs of a skin problem, partly because it looks like grooming. Dogs with allergies frequently lick their front paws, especially after walks across grass in late spring and summer. Over time the fur turns brown and the skin between the pads becomes sore and swollen.

Check between the toes regularly. Look for redness, swelling, a discharge, or a small foreign body such as a grass seed, which is a common culprit after countryside walks. Some dogs develop painful interdigital cysts — firm, raised lumps between the toes that need veterinary treatment.

If your dog is licking paws to the point of limping, nibbling at the nails, or chewing at the base of the tail, that is not boredom. It is discomfort.

Fleas, Allergies and Infections: Telling Them Apart

You can check for fleas at home. Comb your dog over a sheet of damp white kitchen paper. If the dark specks that fall out dissolve into rusty-brown streaks, that is digested blood — flea dirt. Many dogs are not actually infested, but are allergic to flea saliva, so a single bite can set off days of itching.

Here is a rough guide:

• Flea allergy: intense itching over the lower back, tail base and hind legs, often with scabs
• Environmental allergy: seasonal, affecting face, ears, paws and armpits
• Food sensitivity: often year-round, and may also cause ear problems or loose stools
• Yeast infection: musty, corn-chip smell with greasy, thickened skin
• Bacterial infection: redness, pus, crusting and a sour smell

Ear trouble is part of the same picture. Head shaking, scratching at the ears, discharge or an unpleasant smell all deserve attention, as ear canals are ideal breeding grounds for yeast and bacteria.

When to See Your Vet — and What to Take With You

Book an appointment if itching lasts more than a few days, if the skin is broken or bleeding, if hair loss is spreading, or if your dog seems flat, off their food or uncomfortable being touched. Ear pain and persistent paw licking also warrant a check-up.

Before you go, gather a few things that make diagnosis much faster:

• Photos of the affected areas, taken in good light
• A short diary of when symptoms started and what makes them worse
• The names and dates of any flea, tick or worm treatments used
• A list of foods, treats and table scraps, plus any recent changes
• Notes on walks, bedding, washing powder and household changes

In the meantime, avoid human shampoos and strong household cleaners on your dog's coat, and never layer shop-bought flea products on top of prescribed ones without checking first. If you want to try a dietary elimination trial, do it with veterinary guidance — it needs to be strict and can take eight weeks. Most skin cases settle well once the cause is pinned down, so don't feel you have to muddle through on your own.