Why does my dog have crusty black skin spots with black specks?

Question

my dog has black spots on her skin that appear crusty but also seem to have a black string like center. have used frontline, flea shampoo, and spray with no luck in getting rid of the spots. Have seen no live fleas but there are often small black specks around the black sores. Any idea what this could be? Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 9 months and 5 days old | 40 lbs

Debi Matlack · Accepted Answer

Skin problems can have a variety causes. Fleas or other insects can cause irritation that can persist even after the fleas are gone. Treating the environment for fleas is also vital in eliminating the problem. Other causes for skin trouble can include bacterial or fungal infections and allergies to environmental substances and/or food. A dog may have a little sensitivity to some of these but not show any symptoms until they are confronted by several at once. Ideally, I would get your dog in to see the vet for an exam. Your vet may suggest a food trial with a food that has a novel protein source, one that your dog has never been exposed to, such as venison or duck. Proteins in food are the primary reasons for food allergies to occur in dogs.

Why does my dog have crusty black skin spots with black specks?

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