Our older dog is a candy fiend. Wrapping a pill in a smashed skittle does the trick. The key is to give him a couple without a pill first so he's not suspicious, and then give him the one with the pill.

I crush pills between two spoons and put the powder on their food.

Peanut butter usually works...till it doesn't, but liverwurst? if they don't take a pill with liverwurst you have a dead dog!...