<p><b>Size S</b>: Back 9.1"(23cm), Chest 12.2"-13.8"(31-35cm), Neck 10.2"(26cm)</p> <p><b>M</b>: Back 11.8"(30cm), Chest 13.8"-15.7"(35-40cm), Neck 11.4"(29cm)</p> <p><b>L</b>: Back 13.4"(34cm), Chest 15.7"-17.7"(40-45cm), Neck 12.6"(32cm)</p> <p><b>XL</b>: Back 15"(36cm), Chest 17.7"-19.7"(45-50cm), Neck 14.2"(36cm)</p> <p><b>XXL</b>: Back 16.5"(42cm), Chest 19.7"-21.7"(50-55cm), Neck 16.5"(42cm)</p> <p><b>3XL</b>: Back 19.3"(49cm), Chest 21.7"-24.8"(55-63cm), Neck 18.5"(47cm)</p> <p><b>4XL</b>: Back 21.7"(55cm), Chest 24.8"-28"(63-71cm), Neck 20.1"(51cm)</p> <p><b>5XL</b>: Back 24.4"(46cm), Chest 28"-31.5"(71-80cm), Neck 22"(56cm)</p> <p><b>6XL</b>: Back 28"(71cm), Chest 31.5"-34.3"(80-87cm), Neck 24"(61cm)</p> <p><b>Please measure your pet's back /neck /chest size to choose the right size according to the size chart. </b></p>