Samson continued to have vomiting, nausea and lip smacking, even with the Pepcid. Once we switched to the Zantac, his nausea and vomiting were under control. Near the end, they returned, and we added Reglan to his Zantac, which really helped. You should really ask your vet if Pepcid is the right treatment for Boo. If she has ulcers, Pepcid alone won't be enough...you might need to add Carafate (sucralfate) to heal them. I think it's always wise to run a treatment option past your vet and get them on board. My guess, is that s/he'll okay it, as the benefits significantly outweigh any risks, and it is highly likely that you are, indeed, dealing with a stomach acid issue. Good luck!