Hi There. Living in the country I sure can understand your troubles with flea and tick control.

Around here where I live there are so many dying animals, mostly dogs, which if I helped them all I'd be broke. There is such an outbreak of fleas and ticks especially here in Texas with our drought problems. I think it's other places too.
I can pass on info my vet told me for my 6 dogs which stay inside with me and go out to poop and play.
Adams pet products, get the flea and tick collars. He told me they are one of the best that he's seen and used and would help. If your lawn is long, keep it short. If you have fleas in your yard, either get it professionally sprayed or you can go to your local feed store or even Wal mart and get one of the pest control sprayers that hook onto the end of your hose. Fire away. Just make sure it's dry before you let your dogs out on the lawn.
I've tried just about everything, and the one thing which helps my dogs with no fleas and ticks is Adams flea and tick collars and believe me, the dogs around here are infested.
I hope this helps. Take care.