It sounds like it her structure. be careful with fattening foods, it may backfire on you. I have a skinny girl, healthy as it can be, she is just skinny. I dont think she will ever be fat, she had 2 litters, and is spayed, right after spay she gained a bit , for about 2 months, then... right back to her normal weight. She is nice structured at 7 pounds . maybe you are not supposed to breed your girl?
A very fattening food is " science diet a/d" , it is however a prescription food and should not be used for prolonged periods of time. Under vet supervision and with common sense is very safe.
XOXO
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