For a cat, ask for the 4 mg. form. The dose most people seem to use is 1mg (1/4 tablet) twice per day. I used the same dose for my 10 lb. cat as well as for my 8lb. cat. Some of the tablets are tiny, so I don't know how you'd cut them up into a different size to adjust dose more unless you bought a compounded form. It works great, by the way. The only time I had to go to something stronger (anzemet injection) was when one cat had liver problems.