I used to be a 100% cat person and would not have owned another dog (had dogs and cats while growing up).
but.. recently i spent two weeks working for my vet while he was short staffed and i have come to fully realize and appreciate that there is almost nothing in the world like the look in a dogs eyes when they are face to face with someone they trust.
I still like cats better (low maintenience),... but am so much more receptive to dogs.