We had a little boy that looked like this. We called him Tiger Baby. He was retarded. He lived for 2 years, but remained at the 6 week level of intelligence and function. But his Mom was able to litter train him.
"Let's examine the dog mind: Every time you come home, he thinks it's amazing. He can't believe that you've accomplished this again. You walk in the door. The joy of it almost kills him. 'He's back again! It's that guy! It's that guy!'" -- Jerry Seinfeld