If product breaks within 30 days of arrival, please send it back at 2719 University BLVD Tyler Tx. 75703. We will replace it.

 Neck Small=4/5"(2cm) x 10"~16"(25cm~40cm)

 Medium=(2.5cm) x 13.5"~22"(34cm~55cm)

Large=1.2"(3.2cm) x 16"~24"(40cm~60cm)

We recommend you measure your dogs neck, before purchising to ensure you have the right fit for your pup.