Taycie, you are gorgeous in Tropical Sea!
Thank you for sharing pictures.
Looks like the Size 3 is your size, so we'll take care of your exchange.
The Size 3.5 was developed for little dogs with bigger chests, but you happen to be really little.
Love your beautiful collar collection too. I have been trying to think of a neat design for a Buddy Belt hanger, so I'll be interested to see what your mom comes up with.