Mike and Yuki, I think I'm going to let the Drs. address this one since you've asked so much about specific drugs, but my $.02 is that ultrasound is great, but really a totally unnecessary expense. As Dr. Williams says in the FAQ, clinical signs are diagnostic. Hormone tests usually aren't, since ferret adrenals tend to produce an estrogen-like compound instead of cortisol. The brown tooth -- it's definitely a risk, but if you don't feel you can spend the money on it, just keep a very close eye on it. Extraction is always an option -- much less expensive than root canal, and takes away the risk of infection. The swelling could have been something else, but if this has only happened recently and you've just stopped giving the antibiotic, it wouldn't be too unusual for there to be an infected tooth root and the swelling has just gone down because of the antibiotic -- if it is the tooth, it will likely come back. Laura Laura L'Heureux U. of Illinois Vet Med Class of `96 [log in to unmask] [Posted in FML issue 1045]