Dogs have far fewer taste buds than do humans, approximately one for every six. Although their limited number of taste buds register sweet, sour bitter, and salty tastes, it is probably more realistic to think of the dog's response to taste as pleasant, indifferent, or unpleasant. Smell is the dog's most advanced sense - a large part of its brain is devoted to interpreting scent. In addition, it has a sex-scent-capturing vomeronasal organ in the roof of its mouth. This scenting apparatus transmits information directly to the limbic system, the part of the brain most intimately involved in emotional behavior.
courtesty GOOGLE
I must have one of those in the roof of my mouth also
