I'll take a look and see what I can find. I'm not sure how fast it progresses, does it just depend on the dog? We've had to stay away from joint supplement type treats as they make her throw up. It's strange, but it took me about a month of taking away things to figure out it was the joint treats. I may try straight supplements after I talk to my vet, but any sort of joint/hip type treats make her throw up, so I've avoided straight supplements. Sorry to hear about your EM - it's really sad for us to watch already, especially since she's only two! Some days she wants to run and play and others you can tell she's too sore. We're going to try swimming soon to see if that helps...
Sorry to get off topic everyone! I guess the moral of the story is RESEARCH YOUR BREEDER - ask a ton of questions!