They'll let you send them back for sure, they are a great company to deal with in that regard.
The reason they are bigger is so that for the WBs (the majority of their clientele) they will actually fit without having to make an XXXL. Most companies design boots for tiny QH legs and I can't even find boots to fit my smaller WB!
I use a M on the fronts and a L on the rears. For the horses I ride this seems to be quite standard. I can measure the leg circumference if that would help you. I find them actually to be similar in sizing to Woof.
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