We live in Florida where fleas can be a problem year round. My dog was constantly itching and everything else we have tried wasn't working very well. I was a bit skeptical at first about trying Comfortis and the claim that it could kill all the fleas in 30min- 4 hours but I am now impressed! My veterinarian recommended it to us over 6 months ago and I didn't want to switch at the time because I was afraid of it possibly making him sick but his itching started to get so bad that I decided to give it a try. I gave this to my dog on a very full stomach and then washed his dog bed. After it was finished...