The peroxide is adjusted by the size of the dog. Both of our male shelties have at one point been very "naughty" with chocolate and we had to induce vomiting. It's been several years, though and I don't remember the exact dosage for their weight (about 35 lbs at that time). We had a female sheltie first and she never got into the trouble these two do......a true lady!! Today our younger guy (he's three now) got into the grocery bags while I was putting stuff in the freezer and not paying attention.......he pulled a half pound bag of freshly grated romano cheese from the bag and chewed a hole in the bag and was eating the cheese before I caught him!! Made a real mess on my kitchen floor ......all that grated cheese ....not to mention almost $7.00 worth of cheese in the trash!!