I would recommend you get a board certified orthopedic surgeon to look at your pup. They are the only ones who should be doing the surgery any way. They will grade the knee, most surgeons only do surgery when the knee gets to a 4, although some will do it sooner. My Chloe has LP that is a grade 1, at this point she is just on a supplement called Dasaquin. The decision about whether to do surgery or not also depends on the effect it is having on your dogs life.
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 Armani & Chloe |