I love all sizes of dogs and cats, and have had a pet dog all my life minus the last 2 years. I have a cat at home that isn't fond of dogs, which is why I can't board dogs. I don't have formal experience being a pet sitter/dog walker, only ever have had pets of my own. It may sound a bit silly, but I've watched a lot of Caesar Milan and learned a lot from him. The most recent dog I had was an 80-90 pound rottweiler, so I'm not stranger to bigger dogs or "bully" breeds, and I don't believe that certain breeds are bad because of their genetics. The rottweiler I had wasn't fond of other dogs, so I'm familiar with walking her and being in control and avoiding confrontations.