Do they run a lil small?? Like does the XS sometimes look too small and short.....I was going to order a shirt from Petsmart but I don't know if I want to get a SMALL or X-SMALL because if my memory serves me correctly I think there X-SMALL are a lil too small....Bailey is 4 1/2 pounds and he usually wears XS in other clothing but does anyone know about how Petsmart clothing runs??? Your feedback is appreciated!