I've for years taken care of smaller dogs like poodles for my friends and grandmother. The larger dogs I've cared for and walked were mainly my own but I've cared for my father's timberwolf for years when he died. And a few friends had larger dogs that needed social time and play time and restroom breaks often throughout the day. The timberwolf was my senior dog I cared for. Her name was timber and her hips were failing her she was a challenge but she lived extremely comfortably. My friends dogs are a wired haired snauzer, doberman, little hound and a dachshund! They are all different in size but they all get along most of the time. The smaller dogs in their case need separated from larger dogs during meals and taking on walks separately.