LARGE: 18 in – 23 in (Neck Girth) + Leash (5ft). COLLAR & LEASH SIZES: M, L, XL. X-LARGE: 20 in – 25 in (Neck Girth) + Leash (5ft). Specifications (Collar + Leash) Dog Collar and Dog Leash. LEASH: 3ft 6in – 5ft (STRETCHES TO 5FT).