Hahaha I think it's normal. You probably just have a strong relation with food, so when you see something that resembles a food that you like, you start to crave that food. Just so you don't end up wanting to eat a real dog, then you should probably go talk to someone!
oh yeah. this happens to me all the time when I go to the aquarium I want a filet. Then I see a cow on the side of the road I want a steak. Dogs are meat to some cultures. Just go to China or Thailand or Malaysia and you can eat that weiner dog IRL ;)