Why is my dog constantly scratching and biting its skin?
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Overview
If your dog is constantly scratching and biting its skin, it usually means something is making them itchy or uncomfortable. Common reasons include fleas, dry skin, allergies, irritation from washing or grooming, or a skin infection. You may be able to spot a clue at home, but there can be more than one cause, so it’s worth checking carefully.
Things To Check
1. Notice when the scratching is happening most often, such as after walks, after grooming, in the evening, or after contact with grass or bedding.
2. Look closely at the skin for redness, scabs, broken skin, dandruff, swelling, heat or discharge.
3. Check for fleas or flea dirt, especially around the rump, belly and base of the tail.
4. Think about any recent changes, such as a new food, shampoo, detergent, bedding, collar, or grooming routine.
5. Check the ears, paws, armpits and belly, as itching often starts in these areas.
6. Notice whether your dog seems otherwise well, or whether they also seem sore, restless, off their food, or less settled than usual.
Common Causes
Fleas are one of the most common reasons dogs scratch and bite at their skin, even if you do not see live fleas.
Allergies can also play a part, including reactions to pollen, dust, house mites, food ingredients, or something that has touched the skin.
Dry skin, poor coat condition or over-washing can make the skin feel uncomfortable and itchy.
Skin infections, irritated hot spots or yeast overgrowth can develop after scratching starts, which can make the itch cycle worse.
Less commonly, mites or other skin problems may be involved, particularly if the itching is persistent or spreading.
What To Do
Start by checking the skin and coat carefully and note any patterns, triggers or changes you have spotted.
If you can, gently part the coat and look for fleas, flea dirt, scabs or sore patches. If scratching is concentrated in one area, avoid repeated rubbing there, as that can make the skin more irritated.
Keep your dog’s bedding clean and wash it regularly, and think about whether anything in the home or garden may have changed recently.
Try to prevent further self-trauma by keeping nails trimmed and monitoring any areas your dog is biting repeatedly.
If the itching is mild, you may find it helpful to keep a short note of when it happens, what it looks like and whether anything seems to make it better or worse. That information can be useful if you do need to speak to a vet.
When To Contact A Vet
Contact your vet if the skin is broken, very red, swollen, smelly or painful, if your dog is losing fur, or if the itching is getting worse or not settling. It’s also sensible to get advice if your dog seems unwell, is scratching so much they can’t rest, or you’re not sure what’s causing it.
Products That May Help
For dogs with itchy skin, coat care and routine washing can sometimes help support day-to-day hygiene and make it easier to manage the coat while you’re working out what’s causing the irritation.
Related Questions
Why is my dog biting its paws and legs?
Could fleas still be the cause if I can’t see any?
When should itchy skin in dogs be checked by a vet?
Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.