I have an American Eskimo pup who is 10 weeks old and so far we haven't given him any preventative meds. I was researching brands and I've pretty much decided on K9 Advantix. If I use K9 Advantix, which also repels and kills mosquitoes do I need to get heartworm meds? I live in San Francisco right by the beach, so most of the times it is cool and foggy. Also, I live next door to an elderly man who has 2 dogs and they look very dirty and possibly very infested with fleas. We have a 6 foot high wooden plank fence, but I'm concerned that fleas and whatever other bad stuff his dogs have can get through the cracks and get my puppy sick. What should I do about that? My family grows a lot of vegetables in the yard, so I don't exactly want to get some of that flea killing pesticide and spray the whole fence..