our dose is 1/2 tablet of Methimazole, so it's pretty small,
I just tilt her head back with one hand, same hand at the corners of mouth to coax jaw open,
drop the pill into the back of the throat,
keeping the mouth open a litle extra to be sure it gets swallowed.
She can flick them forward on her tongue to spit them out,
or sometimes just get caught between teeth and gums when I though she had swallowed it, only to find a partially desovled tablet later.
when I had to give the difficult one capsules, I found I had to wet them for them to slide down her mouth without gaging her, so the butter trick is probally good too.