My dog is 60 lbs and I also have a 70 lb Labrador/Boxer. M suits both perfectly, although one has a shorter snout. My Yama doesn't really like putting this thing on and chews on part of his mouth when it's on and didn't even go to the bathroom until I taught him to. My lab mix had one before and she wears it with no problem. Overall, this is a great tool for teaching your dog to walk with you. Just remember that you must do your part in the training process by teaching your dog to carry it. Outstanding Quality Guide.
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