Vomiting

Question
We have a nearly 3 month old Labrador/golden retriever puppy.  He has been throwing up once a day at various times since we got him a week ago.
 
He threw up after the ride home from the vet, in the morning after breakfast, and now after dinner.  He seems perfectly healthy and happy to us -  outgoing, active, and hungry.  The vet said that he was fine as well.  The vomit either contains grass or ground-up dog food.

We are feeding him Science Diet Large Breed Puppy, lamb and rice dry dog food.  We are feeding him three times a day.  He eats approximately 2-3 cups of food a day.  He finishes his servings and seems to want more.  He drinks while and after eating.  We take him outside 5-20 minutes after he has eaten, and he goes to the restroom with no problems.  There is nothing suspicious in his feces.  We are also giving him some doggy treats; only between 0-7 per day.  They are Natural Choice Crunchy Treats with real berries.  He chews raw hides which he has just recently stopped being interested in.  

I was wondering whether this is something to be concerned about.  Should we possibly change our routine or dog food.

Answer
I don't see a good reason for it.  Stay in touch with the vet.  Cut out the rawhides.  They are quite dangerous and may be causing the problem.  Otherwise, he may just need to settle in.  You could also slow his eating.  There are not one, but 2 easy, tested, effective ways to control rapid eating. You can spread the food out on a cookie sheet or something. Some of my friends just throw it on the floor of the crate. You can put large rocks in the food dish, much to big to swallow. Either way, the dog can't gulp down one big mouthful after another.

What you are feeding may be about right and it is typical for a Lab to look for more.  You should be feeding a puppy chow now. Switching to an adult chow for the larger breeds at 4 months, slows growth and helps develop sturdier joints.  The Science Diet likely is as good as anything and has a stronger track record than the expensive, premium foods.  

Your dog definitely should be narrower at the waist than the hips and chest. You should be able to easily feel the ribs, but not see them. Each dog is different. Standard recommendations are a good place to start, but each dog must have its food and exercise adjusted to its individual needs. Here is a link to a good illustrated guide, http://www.longliveyourdog.com/twoplus/RateYourDog.aspx