Found this site for an organic solution. Very impressive testimonials though they are mostly about mosquito control. (Worth it just for that!) I called the company directly and they said that in conjunction to taking normal precautions of short lawn etc. this products really works for ticks and other pests too.
If ordered by Monday it will arrive to you in NH - guaranteed by Friday via UPS for the upcoming holiday weekend.
Mosquito Czar
Also, I found a couple articles on giving garlic to your pets orally. A natural repellent for ticks. Worth looking into.