It is possible for any pet to be allergic to any of the ingredients in pretty much anything, if allergy prone, though allergy to Chinese herbal formula's are fairly uncommon.
The most common problems I have seen with Shen Calmer was increased sedation, and occasional loose stool or vomiting. The only side effect I have seen to Liver Happy is that it over cooled an already cool patient (Chinese diagnostic lingo). When any side effect occur and the patient is on more than one formula, as your dog is, the patient should be taken off all herbal formula's for 3 days, than a single herbal formula should slowly be introduced at a fraction of the therapeutic dose. Often the patients allergic immune system will adjust to the herbs, if they are very slowly increased over time. Once the first herbal formula is tolerated the second herb can be introduced.
Discharge from the penis and inflamed gums are not usually signs of allergy. Discharge from the penis could be caused by a urinary tract infection, preputial infection, prostatitis, or prostate cancer. Inflamed gums are signs of Stomach Heat (Chinese lingo), gingivitis, or gum infection. These symptoms are probably just coincidental.
If possible, your holistic vet could try to control the allergies using another formula, Western medicine, immunotherapy, or acupuncture to try to enable your dog to tolerate the Chinese herbs. Some times the potential benefit outweighs the ricks or side effects.
Chinese herbal formulas can take up to 3-4 weeks to show maximum effectiveness.
Thank you so much for your time and expertise. Our lab seems to be doing better now, (no more discharge), and he seems to be calmer, although I'm not sure if it's the herbs or more training. He has been on practically every anti-histamine for dog or human and was even on cyclosporine for over a year and a half. He still takes benadryl and eats hypoallergenic dog food, but no longer needs the cyclosporine and we don't ever want to put him back on it for fear of increasing his odds of cancer. We will stick with the chinese herbs and if he has problems again we will follow your program to reintroduce them. As for the golden with the inflamed gums, we have stopped her Tian Wang Bu Xin as it was given to her to give her more courage which would seem like the heat you are describing and we were not seeing any changes in her behavior anyway after almost three weeks so we will just keep her on her prozac during training. Again, thank you so much for your time and consideration.