What to feed a dog to gain wieght? I've seen many brands of dog food designed for wieght loss, but none for wieght gain.

Jenny has been losing wieght for a while, now. we took her ( and a lovely stool sample ) to the vet to see if something was wrong with her but he said the only thing wrong with her is that she's too skinny.

I know Greyhounds should be skinny, but she seems TOO skinny. I mean, she won't hold still enough to measure accuratly, but she's about 25-30 inches and only around 20-25 lbs. I'll try and put on a photo, but literally, she's only skin and bone.

She seems really healthy, though... She runs full speed for 2 hrs each day through the forest, she's doing well in agility and she's eating all her meals. She is already eating a LOT, but i think she's just burning it off.

HELP ME !!! should I change food, to a higher calorie food or just feed her more?

BONES YOU CAN SEE: ( all measures are from 5 ft away )

8 ribs

2 hip bones ( easily ! )

all the veines and detail in her legs ( her legs are about an inch in diameter )

HELP !!!