have you thought about adding the liquid into some soft food or tuna and stir it up a bit? maybe add it to a small amount of milk? or, if you still have the pills, maybe try crushing them up and adding them to tuna, etc. if that doesn't help then just give the cat the pill like you have been and tell him/her to suck it up and deal with it! LOL Just kidding!:):) good luck:)