Theo grew up with our two dogs, a Keeshond and Sheltie, playing fetch with them, walking them for miles, and teaching them basic commands. He is extraordinarily patient with our now-senior Keeshond: he always keeps her water bowl full, helps her stand when she's shaky and cuddles her when she's settling in for the night. At the same time, Theo can keep our energetic young Sheltie happily entertained. He will willingly throw a ball for a half-hour or more (and has the great aim of a baseball player) or take him for a much-needed run to burn off some energy. I highly recommend Theo as a responsible and caring pet-sitter.