Well, the proverbial 'tender loving care' may well do the trick, here.
The (fantastic) Swedish woman who gives me a weekly back and shoulder massage has a beautiful, engaging and friendly border collie, fantastically well looked after - his coat is magnificent - with a gentle, relaxed, and easy going temperament who always greets me warmly after the massage.
He was a rescue dog, who, before he was rescued from the animal shelter, had been found hanging from a tree and had been horribly abused.
Meeting him weekly, given that he is such a gorgeous, relaxed and friendly animal, it is difficult to imagine that he had this trauma in his background.
How anyone can behave - and choose to behave - with such savage cruelty remains a mystery to me.