I have a Boxer mix named Bella that Marcus has watched numerous times for me in the past, and I've always been pleased with his care for and understanding with my dog. My dog has a dominant disposition and I don't trust her being watched by too many people since she can be hard to handle if you don't know dog behavior with her breed. I've spent time with Marcus and my dog to make sure he understood her behavior and could control it, and I was so happy with Marcus' calm demeanor, and his knowledge of different dog breeds and attitudes that they can carry. I highly recommend Marcus as a Pet Sitter for any dog. If he can handle my Bella, I'd trust him with just about any dog out there.