An unlikely choking hazard!

I have this big blanket I lay on the living room floor for Andrew to play on (it is better than him throwing up on my carpet!). I walked in the living room last night and found these two holes in it. Andrew had bit a hole in the blanket. I also found what he had bit off and it was wet and slobbery - I guess he needs a new blanket so he doesn't choke on this one!!
I knew his teeth were sharp, but...