From Sharyl Mayhew...
In this order: 1. Cage rest, 2. LEASH WALK ONLY and 3. minimal use of pain relievers. Rimadyl is your best bet because unlike previcox and derramax and some of the others it helps keep the joint fluid constant better than the rest. Please don't use bute in a young growing dog.
Use the NSAID to make them comfortable, NOT to make them sound for competition or play. Cage rest, Rimadyl, leash walk only. Repeat again and again and no dog classes, no shows, no playing with the neighbor's dog. Cage rest, rimadyl, leash walk only maybe for a month or so!!!
Pano is a growing dog problem, keep them still, feed them light and let them grow out of it. The ortho specialists lately (last 10 years or so) suggest feeding a low protein/fat food such as....get this... PEDIGREE:) Go figure. Get her off of puppy or any high-end diet immediately, feed reduced portions and keep her a lean as possible until she's past this. Pedigree regular, not puppy or lamb or any other variety, just the plain jane, Costco yellow bag.
Cage rest, leash walking only and strongly Consider Adequan injections to protect the growing joints while the dog is intermittently lame. Adequan equine only (has no preservatives-the canine version does and can cause reactions in some dogs). Call Dr. Jackson 703-385-1054 and he can talk to another vet for them. We give Adequan 2cc IM every 4 days for 8 injections and sometimes monthly boosters of it thereafter until the dog is out of the age frame for pano.
****This does not help with pano in any way***. BUT, it does absolutely protect and strengthen the actual synovial joints (i.e. ball and socket joints like hip, elbow, shoulder, hocks, jaw etc.) so that the intermittant limping doesn't cause permanent damage in a young, growing, goofy, crash and burn, giant breed dog.
Bicepital tendinitis is also common in large/giant breeds, all of the above will help with that too. The most important course of treatment is CAGE REST, LEASH WALK ONLY and let them heal. No packing, no carting, no showing, no training. Work instead on quiet activities, kong chewing olympics, "quiet" time in the crate or on a leash, calm behavior on command and don't try to get back into competition too soon, the shows will still be there for her when she's sound and painfree and more mature and more competitive.