Have you mentioned to her vet about the lack of weight gain Caro? Has she been eating the same amount of food or does she leave some food in her bowl, also is it possible another dog isn't eating some of her food? Just another thought, is it possible she's just not growing right now? I remember taking Piper to the vet because I was concerned he wasn't eating enough...she felt his ribs, asked me a few questions like how much I was feeding him and said he was perfect. I was a worry wart with Piper what with him being my first puppy in 15 years.