Definitely research the subject of lp on here. My Hot Rod went thru lp surgery a year ago March 31st. He went from a grade 1 to a grade 3 in a matter of months. In his case, his ligament was on the side of his leg which made his little leg bow outward.
The surgery corrected what was necessary and our surgeon told us that he should not develop arthristis from this.
He was 1 1/2 when he had the surgery. since then we seen 2 of our regular vets as well as the ortho surgeon and each of them, independent of each other, said that his little knee is a tight as can be.
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The road was a long one in recovering but well worth it. We are now on Dasuguin (sp?). It is cosequin plus basically. We got it at our vets office and will probably continue to get it from there. Feel free pm with any questions that you may have. Best of luck to you and your little one.