How Dogs Taste
Dogs use their large tongues to lap up water, but they have few taste buds in comparison to humans, approximately one for every six, most of them clustered around the tip of the tongue. They can detect sweet, sour, bitter, and salty tastes. However, your dog has no real sense of taste as we know it; he smells rather than tastes. It’s possible that dogs gain more information about food from their sense of smell than from taste. This may account for their desire to for indiscriminate chewing or eating.
How Do Dogs Do That?
Then there all of the other things that dogs can do that seem to defy explanation – a kind of sixth sense. They seem to be able to detect changes in the earth’s magnetic field; they may, to some extent, be able to detect infrared wavelengths of light, a kind of heat that living animals emit; they can detect sudden changes in barometric pressure when a thunder storm is brewing; they can detect vibrations from earthquakes much sooner that instruments; they can find their way home from long distances over unfamiliar terrain. They can even detect your mood.
Do dogs have a sixth sense? Maybe they do. Or maybe, like some believe, it can all be explained by already-known biological mechanisms. However you explain their abilities, dogs and their sensitivities are truly wondrous.