Carl used to eat slow and actually chew, but after we adopted a 2nd dog, he changed. He gets so worried that one of the other dogs is going to eat his food (even though they don't even go near him when he's eating ) that he gulps his food and doesn't chew it at all.

Several things I did to help this was 1. put him in his crate to eat - away from the other dogs 2. wet his food and let it soak a minute or two 3. feed him twice a day, instead of just once. I found that if he only eats once a day he's so hungry in 24 hours he just has to gulp! 4. I've heard putting a ball, a chain, or a larger Kong in the bowl will force the dog to pick around it and therefore eat slower, but it doesn't work with Carl, he just pushes it out of the bowl.