I'd be afraid to treat the lawn with anything (pesticide) if you free range your birds. Not sure, but it would sure concern me.
If you have cats, avoid treating dogs with Advantix. Check with your vet, but I recall hearing that this could harm felines. I use Frontline and tried one of the store-bought brands that are supposedly comparable, but hated the way it was thick and greasy when applied. There are other, cheaper, products you could try, though...
I had a deer tick stuck in to my shoulder blade last year and needed an antibiotic preventative. They seem to start earlier, or as my vet says, continue right on through much or most of winter, which is just crazy.
Good luck. Sounds like you've got them very heavy.
TOB