If he's biting when he's being brushed, then it's likely because he doesn't enjoy brushing, he's fearful of the brush, or he's been abused before. Though there could be other reasons your dog is upset and bites during brushing, you can retrain him to be tolerant and well-mannered during brushing.
Why does my dog growl when I brush him?
Dogs should absolutely learn to enjoy being groomed. However, growls are a blessing in disguise. They should not be eliminated. Growls are a means of communicating discomfort.
Why does my dog freak out when I brush her?
Their fur may have been brushed too hard or that they might have sensitive skin, and will avoid your brush to prevent potential pain. And, of course, some dogs are also just impatient. They've got energy to burn and don't want to sit still.
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