I usually have my dog on Heartguard Plus in the cold weather months and Revolution in the warm months to prevent fleas. I used Advantage Multi before our vet stopped carrying it. (We get it from the vet because he sells it in single doses.) Revolution went up, however, by about $5 a month, so I'm looking at different options.
How do you know which heartworm and flea preventative is the best one to use? How/where do you get your meds?