Is my German Spitz is pure bred original breed How to confirm the same. He is about 75 days old

I have a one year old Labrador boy. He has been diagnosed with patellar luxation in both his hind legs. For the past three days, he is not eating properly and seems like has gone into depression. The vet has advised surgery but only in Ludhiana. Can someone suggest a place where i can get a brace till the time i get the surgery done.