If you have a boxer who loves to dig around the garden, it's most likely that he has "Fritos feet." These are little burrow-like holes that can appear between a dog's toes and a garden's concrete. This is a natural habit that dogs develop to get a grip and dig up roots to eat, and they do this frequently without your knowledge. Your vet should examine his nails to see if they're broken, bent, or infected. He should then recommend a special nail care product to help with this problem.