I have requested a change to that page to inclute information I found several years ago, and it is still not included. Accroding to it, Happy Cat was born in 2001 and apparently is still alive, I've uploaded some more photos of him in the gallery to preserve them in case original sites would go down.
My original post from two years ago:
The true origin of a Happy Cat was revealed thanks to blogspot user Corpuscula (post โ http://corpuscula.blogspot.com/2010/07/blog-post_9590.html) and a person nicknamed Julia in that post.
Original photo was taken for a year 2002 calendar, and looked even funnier, thanks to a โsad catโ next to โhappy catโ : (http://4.bp.blogspot.com/m0O2XlVi3Mc/TD8ZbaOdBiI/AAAAAAAACdo/l5D35tDd7L0/s1600/Solomatina_11.jpg)
Happy Catโs actual name is Mishel. He was born in 15.07.2001 in Russian pet center โะขัะผะฐะฝะฝัะน ะะปัะฑะธะพะฝโ (โFoggy Albionโ) in Moscow. (http://www.tumalbion.ru/details.php?aid=3)
His photos, including the one,used for โCan i haz cheezburgerโ picture, can still be found in sites gallery : http://www.tumalbion.ru/boys/index4.htm. There is one particular photo, that proves photos origin: http://www.tumalbion.ru/boys/slides/bigman9.htm โ on this picture Mishel is seen lying on the same couch, that is present on canonical picture.
Unofficial (web 1.0) site with lower quality photos of Mishel and that โsad catโ can be found here : http://tumalbion.narod.ru/, along with some other photos of cats on the same couch, including low quality group photo of Mishel, โsad catโ and two younger kitten (http://tumalbion.narod.ru/solomatina4.jpg).
He now lives happily with family that took him in somewhere in Moscow.
This cat is one of the oldest memes, and I really would like to have this information included in the main article.