Chilly Dog 3XL fits our Dane, who is turning out to be a runt at 18 months/130lbs. This is the largest size they make, so bigger big dogs are unfortunately out of luck... XXXL Boyfriend Dog Sweater https://www.amazon.com/dp/B007WAK63M/ref=cm_sw_r_cp_tai_U5l1DbDGV4T76