Alex's first word is "Dog"???

Alex seems to love playing with my dog, my mom's dogs, my friends dogs. Today at my mom's house, he looked up at Rocky through the window and he kept saying something and my mom said "I think he's saying Dog." Well when we went swimming, Kristy had her dogs there and Alex kept following them around saying something that sounded just like "Dog". He won't even say mom, but he says "Dog"??? LOL I really don't know why these pictures are sideways... they weren't like that when I uploaded them so I don't know what happened....