My dog is 51lbs racing weight and I struggle to get him in most traps. If it says up to 55lbs should have traps so they all fit in comfortable not just the smaller dogs as with the smaller dogs you can always just put a bigger kick board in. But squeezing 55lbs dog s in whippet traps seems like an accident waiting to happen dogs welfare should come first. That's why I train my dog at Maltby as traps are for all. J.m.o