What a difference a year makes! We are having 50 to 60 degree days here on Long Island so clearly the dogs still need to have flea and tick preventatives. I put preventives on year round, I think that there are some outdoor places where the fleas never die. This is not scientifically based just based on personal experience. Warm winter weather can be helpful to fleas.
Another thing that has been on my dog walker mind of late is the brevity of a dog's life. I have been walking and boarding dogs full time now for 5 years and some of my "clients" are starting to show aging.