I have a four year old neutered male bullmastiffXrottie with some issues. Since he was young he has been a 'nibbler'...at first just occasionally on himself and his owners but since they began travelling with him frequently in a motor home for their jobs in the oil field he nibbles with his teeth on anything (people, clothes, himself, walls, rocks, etc) and does it obsessive-compulsively (gets totally fixated and does it very frequently). The female owner is at home with him and he gets lots of exercise. We are starting some behavioral therapy but they are wondering about herbal options. He is very healthy otherwise except a sensitive GI tract (seems to get diarrhea/looser stool with any diet change). What would you suggest? Thanks in advance,
Beth