My 1-1/2 yr. old cat has been heaving a lot lately. 4 days ago she throws up a large hairball so I am assuming she is trying to again without success. The last 3 days, I have given her cat lax without success. I would like to know what the dose is for butter. If you think Vaseline is better I could try 1 tsp. of that instead. Thanks for your help.