Eating behavior of a dog: Why does he have to eat so quickly?

Let’s play “Let’s Imagine.” Let’s imagine you’re only days old. You’re hungry. You know where the food is, but so do your eight brothers and sisters. Luckily, there are enough food outlets for… six of you. I guess that’s not as lucky as I thought.

And guess what!
All eight of your brothers and sisters are hungry, too! Do you want to eat now or in 30 minutes, when one of your siblings might have had their fill and let go of their assigned food outlet? Oh, but if you do wait 30 minutes, you run the risk that the sibling, now happily full, just wants to take a nap while still clinging to that lovely, warm food outlet.
Why are you still standing there? Get your butt over to that food! Now you know how your dog felt for the first few months of his life. With limited access to his mother’s nipples, he and his siblings bit, scratched, and stepped on one another in a race to get to them first. Those who didn’t get there quickly enough ate after the rest were finished or, worse, not at all if their mother was tired of lying still and wanted to get up and move around.
After learning that behavior as a baby, he may still think that his food supply is always limited and on the go. This is why he scarfs down whatever you put in his bowl as though he thinks you’re going to try and go after it yourself, and it’s also why he may feel the need to take the turkey off the counter and run.

Why does he eat grass?

Have you ever gone on a fast-food bender, eating anything you can find with the word “fried” in the name?  When you came out on the other side of those dark, frightening days, you may have found yourself craving something cold, crisp, and nutritionally clean - something like a salad. Your dog’s body works the same way.
Every so often he may wish to partake of a few juicy blades of grass to compensate for a lack of vegetable matter in his diet. If you notice him grazing often, try switching him to a food with higher veggie content or even give him some steamed veggies as a treat, as they’re far easier to digest than grass. Another reason he may be visiting Nature’s Salad Bar is to help calm down an upset tummy.

Dogs will sometime eat grass to induce vomiting if they’re not feeling well, which is a natural and fairly healthy way to fight illness. The only time you need to worry about your dog’s vegetarian habits is if they start interfering with his regular diet and nutrition. If he refuses to eat his normal food or is inducing vomiting too often, a trip to the vet is probably in order.