Yeah mosquitos are a huge danger now depending on where you live. We live in Maryland and even though people are no longer getting sick from the west nile virus we are still finding dead song birds. two weeks ago it was a scarlet tanager.

The west nile virus is much more dangerous to birds than humans. Although I don't think it has gotten to california yet I know it has made its way to texas already.
I am guessing that since your dogs have flea problems you are probably using flea collars or dips/powders. Most of these are not really good for the dog or people, and do not work nearly as well on ticks or fleas than the new products that are applied once a month. You probably want to think about ticks even if you don't see them me, my husband, and my sister have all gotten lymes this year and it is miserable. If it is not caught soon there is permanent neurological damage, I have seen both dogs and horses put down because they were in so much pain.
Advantage: just fleas, but pretty good at that.
Frontline: fleas for 2-3 months depending on how frequently you was ticks for 1 month
Advantix: ingredients found in advantage plus permethrin it claims to do ticks, fleas, and mosquitos for 1 month.
I have never used advantix because permethrin (an ingredient that used to be in people bug spray before they found out it can be toxic it is still found in anti-insect clothing) can cause illness in dogs particularly small thin skinned dogs(the company has actually put out a warning to vets), and since the stuff is designed to be absorbed into the skin and remain there if your dog has a bad reaction there is not much you can do.