Beast Pain

Puppy seems to be in a lot of pain this morning. Last night he licked his knee for the first time that I've seen. He was gimpy after our walk all day yesterday. This morning he's drooled a few times, and he's not putting any weight on the leg when he stands, although he does when he walks. I called the vet today for some opiates; it's something we had talked about a few weeks ago.