Re the bute and horses, it's a common effect of bute.
Chi used to willingly take the doxy without being hidden in anything because it is flavored. With the digestive upset last summer, that was usually part of what she vomited back up, but not the cause of it apparently. Ever since then I've had to hide it in other food that she then swallows whole, usually just enough canned dog food to stick to it and hide it or the same idea with cream cheese. I also give it while she's eating during the middle of the meal to make sure there's food afterward to make sure the pill goes all the way down and is never the first or last thing she eats.
The doxy I get is a quad-scored pressed tablet that breaks apart easily by hand. The commercial pills I used to give had to be cut with a pill cutter that was difficult because of the hard shell coating, and those dulled the cutter pretty quickly too. Since I was cutting them open, that coating didn't do any good either. I've never had capsules for her, probably because I wouldn't be able to scale them down to her dosage.