Hello fellow Vizsla lovers! We live in Western New York State. It is considered zone 5 for planting purposes. We have warm to hot summers and very cold winters. Ernie is 16 months old. Last year we gave him his last dose of nexgard in December when we got freezing temperatures, and continued heart guard on the advice of our vet year round. We started heart guard again in May. This year I am questioning if he needs heartgard all winter. I am curious as to what method the forum members use for protecting their dogs. I always want to do whatever is best for our boy and balance protection vs exposure to chemicals.