All dogs are different so you need someone who pays attention to detail and can notice each individual. If they have a thorn in their paw or If the leash is wrapped up or if their tongue is large and dry (needs water!) I WILL notice. I have been a dog sitter a hand full of times for family and friends and each pet has their own way of playing and interacting with others which is important to know. Not a lot of people consider the possibility of over exercising their dog but some pups just don’t know when to quit so it is really important to allow for breaks when playing hard. Some dogs might try to get away with certain things when their master is gone but a stern voice will usually do the job.