we have a 127 lb Akita Inu and the amount sold did not complete the treatment , the 3.5 oz may work for most dogs "but" not for a Large dog with a long and heavy coat we used the product as instructed "but" ran short and did not cover the legs properly ,offering a small and large size would help 3.5 oz and 5 ounce large size - for large dogs ,would be great so people like us won't have to repeat the treatment over and still run short on product , it is an amazing product just not enough product for extra large dogs