I have grown up in a house with dogs. 29years of being around dogs and 12years of taking care of dogs. I have 2 dogs and a cat at home. I have a senior boxer and a boxer mix that is still pretty young. I can bathe your dogs when watching them and have helped in 3 different dogs giving birth. One of which was my own and 2 were dogs that I was watching in their homes. I don’t have any vet experience but my sister-in-law works at a vet office. Age of your fur baby isn't an issue. I have also dealt with older dogs who had special need and dietary restrictions. I have been around and cared for small dogs like chihuahuas and large dogs like mastiffs so size isn't an issue.