Mouth size control: No. 1 suitable mouth around 18cm pet

                               No. 2 Suitable mouth circumference around 22cm pet

                               No. 3 suitable mouth around 26cm pet

                               No. 4 for mouth around 30cm pet

                               No. 5 for the mouth about 32cm around the pet

                               No. 6 suitable mouth around 38cm pets

                               No. 7 suitable mouth around 41cm pet