M size [size: 126mm*125mm] size is larger than the common products on the market, smaller than the medium size, but the size of the brush head is longer than the medium size of the products on the market, and the use effect is better.L [size: 156mm*155mm] size is larger than the common products on the market, smaller than the large size, but the size of the raised point brush head is longer than the large size of the products on the market, and the use effect is better.Our products completely solve the same kind of products are not anti - bite shortcomings After 30 days of continuous testing, our products have been tested for more than 10 kinds of dogs, such as labrador, golden retriever, Beagle, poodle, cock spaniel, Boston Terrier, Samoiler, Corgi, Border Collie, Schnauzer, St. Bernard and Husky. According to the test results of the product raw material and production process for various adjustments to solve the same products in the non-anti-bite shortcomings, tasteless and non-toxic Pet dogs can be used for a long time