Re: DO they sell these doggy sweaters in the parks?
If you go to World of Disney, they usually have a pets section. We've found some cute items there, including Mickey ears, for our pups. Also try your local Disney store, our CMs at the local store will actually set stuf like that aside, and show us when we enter. (They know a sale when they see one!)
If you see a cute yellow lab puppy with a yellow cape, WAVE! It might be us! (Or it may be someone else that lurks here!) Thank you for asking before you pet! Next trip, Dec 22-Jan 3rd.