[anonymously]

Any veterinarian or vet tech can show you, just pop the pill down their throat and rub under the throat/neck area until you feel a gulp indicating that the medication has been swallowed.

I assume you are talking about medication that has been prescribed by a veterinarian that has examined the dog. Most supplements are a scam.

Regarding supplements: http://skeptvet.com/Blog/category/herbs-and-supplements/

http://www.pbs.org/wgbh/frontline/film/supplements-and-safety/