Hey girl, so sorry about Teddy limping. Glad he's walking better now. It does sound like LP to me.
I had Trixie at the vet a few months back and her one knee is a grade 1 and the other is more like a 1-2. My vet also recommended a glucosamine type suppliment. Gluco is good for the joints. I bought this stuff from my vet but for double the price.
Here is a link for you but there are many differen't types of suppliments out there. Good luck with Teddy.
Dasuquin with MSM Small to Medium Dogs - 84 Chewables : Pet Supplies, Dog and Cat Supplies, Pet Meds, Flea & Tick Pet Products