Cute pups!
Mosquitos also carry West Nile Virus. You might ask the breeder if she has been doing any natural repellent to protect the pups. For example, if she's been feeding the mom garlic, then the pups would be getting that in their milk and they'd have the garlic in their system to keep the mosquitos from biting.
Oh, and make you have the vet test for heartworms before beginning any preventative. If you start a preventative and the pup is already infected, it could have serious consequences.
