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For a 90 pound golden a full tablet of Pepcid AC, tagament or Zantac is fine twice daily. I seem to see the best results with Pepcid (famotidine) and Tagament (cimitidine). There can be a little trial and error with this group of meds (called H2 blockers). You may also see a benefit with 2 teaspoons of maalox twice daily, but I would start with just the pepcid and go from there. It is also important not to give it with the sucralfate as the sucralfate could limit absorption. I hope this helps and gives you direction.