Hi and welcome to YT.
The best advice I can give you is to see an Ortho Vet ASAP. I know you trust your friend but given the unusual severity of this case, and at *such* an usually young age - it is really nothing you'd want to take casual advice about. You really want someone who specializes in this to assess it properly - to do films etc and see what else may be going on in there.
I've had knee surgeries on both our Wylie (double LP) and our chi, Arthur (double tears at different times). Both have done so well afterward - no limping whatsoever.
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~ °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |