I have grown up with dogs (german shepards, boxer mix, bernese mountain dog) so no dog is too big for me. We had each dog from the puppy stage to old age, so I understand how much work a puppy can be and how much TLC an older dog needs sometimes :) I have dog sat for numerous dogs in the past and absolutely love to do so. If your dog does benefit for going on a run, I am more than happy to run with them, or just take a slow walk if that is more their speed. Rock creek park is one of my favorite places to take a dog on the weekend as well as the numerous dog parks in the city!