"I'm A Lover Not a Fighter" Dog Hoodie (Grey, Large 40-45lbs) Hoodies have ribbed sleeves and hem for a comfy fit. Length: Measure length of pets back from the base of the neck to the base of the tail. Neck: Measure the circumference of pets neck for a snug fit. Chest (most important): Measure girth around the broadest part of the chest and add 2. Note: If the dog has a broad build, select one size larger.