It depends on the brand, etc. I never just *only* buy small or medium, etc. Jackson is 15lbs and generally speaking, he's medium. His Puppia harness is medium, most t-shirts from stores like Target, etc, are medium. But there are some brands that run realllyyy small or were only made for small dogs and he'll need, like, an "XL" or something. I go by measurements. He's about 13" long (from neck to base of tail) and 17" around his chest. Jackson was 12lbs by 6 months old and stayed 12lbs until 1 year and 2 months or so... then he went to 16lbs (but he wasn't overweight, just still growing). Now he's about 15.1lbs. |