Believe it or not I was a very skinny child, which is the opposite of what you'd picture with a child who eats pet food. I was actually a very picky eater. Maybe I had pica. But the greater possibility is that I'm just a weirdo.
EDIT: looked up pica. I also used to eat salt by itself and I still drink pickle juice. went through a stage in my teens where I compulsively ate ice. how effing bizarre.
can't judge on looks.
[YOUTUBE="0TN1_EgYdfU"]strange addiction[/YOUTUBE] My coworker had terrible pica with crunching tons of ice all day long, to the distraction of others.
Heavy, prescription-strength iron meds finally made it stop. Which was good, her iron was so low it was almost at transfusion levels.
I've also heard that ice chewing can be a sign of aggression.
I never tasted pet food. Once someone got really hostile towards me because he firmly believed everyone has tasted pet food and I was denying it for some reason.