
Hi Steffini,
Gaviscon works in a slightly different way to Tagamet, or Zantac. I don't think it would be harmful for a dog, but I don't actually
know Zantac, on the other hand is something I know is OK to give to dogs. It contains
ranitidin instead of
cimetidin as in Tagamet, but both substances work in the same way.
150 mg of Zantac would be my guess of how much to give. Can't you get help with the dosage from your chemist, or maybe give your vet a ring?
HTH
Karen