Gloriajean,
Its a real hard call to make especially if you live in an area with alot of mosquitoes. Where I live though the mosquitoes slow down in October.
I gave heartgard routinely and advantage in the past and didnt have cleft puppies. I didnt have the problem until I switched to revolution. So maybe that will make you feel better
The problem started when I reapplied the medication in MID pregnancy too.
I just wont be giving chemicals at all anymore during gestation.