FOR CAT-SITTING: I own 1 cat but 2 other housemate each own 1 too. They all arent too territorial when we once in awhile let in a stray that has been friendly mainly cause two of them are outside cats and mine is indoor however my cat may become territorial if i let a unknown cat in my room as he is mostly in my room but he is pretty friendly most of the time, he'll just come up to sniff them and just keep sniffing until the other cat has enough of it and get mad. I've taken care of friend and family dogs before(For an example, the white dog with black dots in the picture, is my sister-in-law's dog) walking them, playing with them. Even took great care with old dogs that need special cares, like small dog with bad joints make sure to give them their meds every day and making sure they dont get hurt from playing too much, and then even bigger dogs that have been hurt and been burned before from previous owners making sure to calm them down if get spooked all of a sudden. I will train some dog stuff like sit, stay and their choice of tricks if they are ok with it. I have taught my cat a few tricks like those too. But mostly I just take care of them, play with them and given them lots of love so they don't misses you too much. And if you dont got a dog harness and leash or have lost them, I have a spare I can use for walking them with.