Don't use flea or any other type of parasite collar. They have lots of harsh cemicals in them, and honestly I've seen fleas at work crawl right over the darn things anyways, they don't work.

If you're using the Frontline PLUS you don't really need to comb out the live fleas as they WILL die. But combing out the flea dirt and dead fleas would probably help keep your critters cleaner.

Also if you have fleas like that, you may want to watch your critters in the next 3-6 weeks for signs of tape worms. They are small rice sized segments that may be on your pets stool, or stuck on the fur of their backsides. If you see those you need to call your vet for some medication for them.