[LexiDog]

Try putting it in a warm water bath in a ziplock bag to take the chill out of it without actually cooking it. Or have you tried just giving it as a treat? Maybe until he is used to the taste and texture? Have you taken him to your vet to make sure there are no underlying issues as to why he is not gaining weight? Double the recommended amount of Orijen, you would think any dog would gain weight.