Clothes are really hard to fit even for our own dogs. It's perfectly fine to send something that you know they can enjoy rather than an outfit that might not fit. Trust me, a small in one brand is a medium in another. I See Spot fits Sammy but Loki is in between sizes. The reverse is true for Ruff Ruff and Meow. Plus, you have a boy so you probably don't know which brands run big or small

, so DON'T WORRY ABOUT IT!