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10 Answers

–5 votes
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Flea allergy = One flea takes one bite on your dog (before the preventatives have time to kill it) and this sends your dog into an allergic fit - he will tear up his backside, maybe even his inner thighs and develop skin infections and all the rest. Odds are this is what your dog has.
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If your dog is biting its tail, it may be because it is suffering from environmental or food allergies. Some of the most common environmental allergens include mold, pollen, or household chemicals. Dogs may also have a food allergy, with some dogs being allergic to poultry, wheat, potatoes, or even some types of vegetables.
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My Online Vet Response for: Dog is biting fur off lower back by: Dr. Carol Jean Tillman Hi Margaret, Without a photo of Franco, I am at a bit of a disadvantage in diagnosing a skin problem. From your description, I would expect him to have some sort of redness to his skin, just due to self-trauma, if he is licking or biting his fur that much.
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Hi our St Bernard has a skin problem, he seem to keep biting his back and tail area till its sore, this has now made his spinal area from shoulders to tail very sensitive so when you stroke this area & read more. NancyH. Dog Expert:Rescue, Train,Breed,Care. Bachelor Degree.
–3 votes
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Tail biting behavior often arises as a response to itching and discomfort caused by parasites, usually arthropods like fleas and ticks. These parasites cause allergic reactions at the bite site, with itching and burning sensations associated with histamine release.
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As well as chasing and biting his tail and biting and licking his back paws a lot! what is this? He could have allergies or an ear or skin infection. Your vet can do some simple tests to figure out how to help.
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When dog scratching gets out of hand, it is often the result of allergies to food or environmental triggers, including mold and pollen.

Dogs may also develop a skin irritation called contact dermatitis when they encounter substances like pesticides or soap. Boredom or anxiety.

+5 votes
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If your dog is biting the same specific area on its tail, it might be a sign that your dog has some kind of external parasitic infection. The most common form of these infections come from fleas or ticks. If your dog has been outside in a wooded area or around other animals recently, they might be at risk.
+4 votes
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Dogs can bite themselves due to parasites, anal glands being impacted or infected, wounds or yeast and if they continue doing this when not doing normally it can be their way of letting us know there is a real issue. Sometimes it is just normal behavior especially in puppies. Dogs can exert these biting and itching behaviors due to
+4 votes
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Youd be surprised at how many cases we see of dogs biting or licking their paws  especially in summer and autumn. The problem is, there can be so many different reasons for it, ranging from allergies and insect bites, to boredom or anxiety. The first thing you should do is contact your vet.

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