Q.Squirrels

Squirrels are gnawing their teeth on various things around the yard–base and large branches of fruitless pear trees, fence, base of rose trees, and also have begun popping out the buds of our gardenia bushes. I’ve heard dog repellent would be a cure and would appreciate some advice as to a homemade remedy or shelf product that would be effective in keeping the squirrels safe and continue to play in the yard without gnawing.