In the Greyhound adoption world, it is more likely the case that our adopted Greyhounds have become a bit overweight which presents an entirely different set of problems for the adopter.
But sometimes there are those Greyhounds who are "hard keepers" which means weight is hard to keep on them. They require a bit more food per meal and sometimes that is not even enough.
A wonderful, healthy way to get some weight on a Greyhound is to feed them something called "Fat Balls". These are fed raw and most require about 4-5 balls per meal, however, as the recipe indicates, you can feed up to 10 per meal. These are fed in addition to their normal kibble or you can feed alone as a meal.
Here is the recipe. Again, DO NOT COOK!
2 lbs. raw hamburger (the cheaper and fattier, the better)
3 or 4 raw eggs
1 c. peanut butter
1/2 c. Karo syrup
1 c. wheat germ or 1 c. oatmeal
Dump it all into a large bowl and mix it together with your hands. Form it into balls about the size of a ping-pong ball, and feed up to 10 meatballs per serving. Freeze until served. It's better served raw to preserve all the fat.