Satin balls can work for you but beware, as I recall tummy problems over there?? Introduce very slowly in very small amounts. The rule of thumb for average giant wieght gain is around 10 lbs a month. But that is an average, it may vary due to growth spurts and such. Being on the lean side is not a bad thing for those developing and growing bones. As long as she seems happy and energetic, bright eyed with an improving coat, I wouldn't be too concerned.
Stella
Okay, thanks for the advice, yes the tummy problems were over here, haha, and that's the first thing I thought about when I considered trying them w/her. I think their initial gain was good, esp considering that she has to make up for being under to start so maybe it's a slower go.
I hope she's happy, but she doesn't seem as happy as Yukon, but that could be her personality, he is more personable at this point. She's pretty energetic, still waiting for her coat to improve. She doesn't eat much still, whereas Yukon dives into his food, she doesn't consume much.