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How much do dogs really comprehend? Dog cognition centers around the world are attempting to grasp how much dogs really know.

For example, in the UK a retired psychologist John Pilley taught a Border Collie named Chaser to identify 1,022 toys and objects by name. In fact, it appears Chaser can understand complete sentences.

However, Adam Miklosi, founder the Family Dog Research Project cautions, "Understanding is a very vague term, and I try to avoid it if I can."

He adds there's no question that dogs do respond to tone of voice. You can make the trick to tell many dogs in Hungarian or in English the same sentence or command, and they will perform the same action mostly based on the body cues and the context, as well as partially on tone of voice.

While the average canine may not be as brilliant as Chaser, Pongracz adds: "We learned going back as far as 2001 that dog owners are of the opinion that their dogs do understand them, not only single words, but actual sentences. By understanding, I mean responding correctly as we might expect. So, if I say 'We're going to the vet,' and the dog hides under the sofa; however, what we don't know is what the dog is really understanding."

Is the dog actually comprehending the sentence, is that one word, 'vet,' in that sentence, or is it all about context, perhaps the only time a certain leash is used?

"Obviously we don't have empirical data to understand these claims, "says Pongracz. "But clearly dogs do truly behave in ways that convince their owners that they really do understand."

He continues: "Recently our colleagues found with brain imaging techniques that dogs' brains respond not only to the intonation/emotions, but the verbal content of such words that dogs probably heard previously, and [heard] often. It is important to note, however, that these brain activations happened mostly when the verbal utterance and the usual intonation with it appeared simultaneously."

Pongracz's work confirms what dog owners have known for centuries. Dogs are really adept at picking up on our emotional cues. If you feel and act sad, your dog responds one way. If you feel and act overjoyed, your dog acts another way. Dogs clearly pick up on our emotions. When we're being funny, our dogs may act playful.

However, Miklosi stops short of saying dogs actually have a sense of humor. And he adds, "I know many people who also lack a sense of humor."

Learn about the Family Dog Research Project at http://familydogproject.elte.hu/

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