I agree with Jakoda.
One should read up on the toxicity of the mass produced flea and tick products. I try to use as few applications as possible during the summer/fall months in MN...and I wouldn't use it at all if we didn't have to deal with deer ticks ( Lymes ) up here. I know my vet wants me putting the crap on her from March through November .....and now some are advocating it all year...not for me however. You should investigate the disadvantages of topicals and the other ways to deal with ticks and fleas...in a less toxic method.
I use Heartguard Plus as well due to the mosquito being the Minnesota state bird.