Spirit is a color headed white (tri-color). She has not been tested for the MDR1 mutation but both of her parents are negative so she is most likely negative as well. I would have to pull out the vet records to see how old my younger dog was when she was vaccinated. I think she was about 9 months. But don't hold me to that. I honestly don't remember. She might have been a little older.
And yes, down here the weather is never cold enough to kill fleas and ticks, so unfortunately both dogs have to also be on a flea and tick preventive plus a heartworm preventive year round.