For those that give their minis ranitidine for ulcer prevention, what is the dose? I forgot how much I gave of the 150mg tabs. I know it was 2X a day, but one or two tabs? I need to put Lexy back on bute for a couple of days for sore feet/laminitis and need the ulcer prevention. She weighs about 370 lbs. My vet won't be back 'till Monday. Thanks!