Hi Lucretia,
It sounds like you have your work cut out for you. Regarding your questions:
1. I've tried to find info on that conversion of IU to GDU (a new form of measuring bromelain potency) but haven't been successful. I would advise dosing on the high side - at least the maximum human dose your product label recommends.
2. This is a tough one to answer. I'm not a huge fan of mixing so many Chinese herbal formulas together, but would hate to steer you away from that mixture if the person who suggested it swears by it. The success rate with Hoxsey is probably a maximum of 50 percent of cases, so if the other person says their success rate is much higher, than you'd have to go with their formula. Given that they have incorporated so many divergent formulas anyway, there's no problem in using Hoxsey with it. But if Hoxsey did happen to be really well suited to your dog, then the added herbs might interfere with that. So I'd talk to the other herbalist and see what their success rate and clinical experience with OSA is. If it's high on both counts, please let us know! We're all looking for new therapies!
3. For vitamin A and D, we now give it orally, but for a case as severe as this, now also give it daily. Whatever you were going to inject, just put in the food. In addition, put several drops in the DMSO on the lesion - it's probably not important at the outset to be that specific with dose. Later if you get good results, you can scale back the vitamin A and D to more comfortable levels. In addition, be sure to apply some of the Hoxsey via DMSO, too.
4. I have the same answer for this as for your second question. Dr. Goldstein is the best to comment on his success rates. Could it be helpful? I guess so, although ozone is supposed to be an oxidizing agent and vitamin C an antioxidant, so there would be room for conflict I think. Of the two, I'd choose the anti-inflammatory antioxidant effects of the vitamin C. I'm not sure what IAT is.
Hopefully this is somewhat helpful. Sorry I couldn't give more concrete answers. I wish you well.
Steve