For me I think it’s the fact that animals just warm up to me very quickly. I’ve had owners who are shocked when their pet who normally doesn’t like new people right away is wagging their tail and letting me pet them within minutes or when I send them pics of their pet on my lap or sleeping next to me! I’m also not intimidated easily, I don’t make a big deal if I get jumped on, etc. But overall I think just them seeing their pet content makes them feel at ease and they’ll give me a great review and use me again for future sits. I also try and send them lots of updates and pictures during the stay too!