Have a look through the other posts on this site related to eating - they will help a lot.

The number one, well two after a vet visit, is to not let it become an issue with the dog.

Once food is seen as a tool by the dog it can be very hard to get control back.

Have a look at the other posts - cut the time allowed for feeding to 10 minutes, leave the dog alone to feed, practice ignoring the dog for ten minutes before you feed and ten minutes after you pick up any left overs.

In one way this is a good thing - because you have noticed it early.
It gives you the chance to take a huge amount of stress from your dog.

After you have looked through the other posts feel free to ask any questions that you may have on the site, private message or email.