Yappily Ever After Dog Tuxedo This East Side Collection Yappily Ever After Groom Tuxedo for dogs makes it easy to include pets in the wedding day fun. White satin shirt is paired with a double-breasted tux coat with tails. Sizing: Back: Measure length of pet’s back from the base of the neck to the base of the tail. See below for estimating by breed. Neck: Measure the circumference of pet’s neck for a snug fit. No need to add inches as you would with a collar. Chest/Girth: Measure girth around the broadest part of the chest and add 2”. Note: If the dog has a stout build, it may be best to select one size larger.