After three years he's reunited with his owner: his emotion is uncontrollable !

While we have little to determine how long lasts the memory of a dog in certain situations and experiences, we know that some bonds remain engraved in his heart forever: this dog is able to recognize his master despite it's been 3 years since they were last together. At first he's adorably confused and doesn't know how to react, but then his joy is overwhelming, he can't contain it in any way.