The best way to get the correct size is to measure your dog from the collar to start of tail along their back.

 

Mini seat 40cm externally internally 30cm (suitable for very tiny toy breeds ) Special order

 

Single seat is 50cm externally internally 40cm

 

Medium seat is 60cm externally internally 50cm

 

Double seat is 70cm externally internally 60cm

 

All seats are the same width and elevation only the length changes