He is a staffordshire.

This is what breeds Kramar have listed the Medium is for:

Size M: Basenji, Beagle, Border Collie, Buhund, Cockers, Rough Collie, Saluki, Samoyed, Staffie, Standard Poodle

You are most welcome to it if you like. if so PM me a postage address/name to attention to and i will send it over