Check with your vet for any underlying medical condition. It could be Allergies to fleas, food, household chemicals or any number of things that are aggravating its skin, or it could be a behavioral problem. A vet will be able to treat any skin problems.
Biting and running away.
You have to train it. If it doesn't listen, then you should take it to obedience school.
I can give you several sentences.The fleas were biting the dog hard enough to make it yelp.She made a biting remark and hurt his feelings.Are the fish biting today?
By biting.
biting
Keep your dog inside the house
a biting purse
A bull shark protects itself by biting.
A vampire bats protects itself by biting the prey.
It defends itself by growling and biting its enemy and scratching it
Dog muzzle
Scratching and Biting.