There are a number of ways to determine a starting caloric level for healthy weight loss. (thebark.com)
If the individuals were not on a strict caloric level, then the amount of fat gained or loss is essentially random. (sweatscience.com)
If your dog doesn't lose weight, or loses weight too rapidly, that particular caloric level is not right for that dog and should be adjusted up or down as necessary. (thebark.com)