How can i fatten my dog up?

[Marne]

My dog/puppy (10 months old) has always been slim looking, i thought she would have filled out by now but she looks too skinny, we feed her expensive dog food and she has more than the recomended amount for her size and breed. She has a sensitive stomache so doesn't have many treats/snacks apart from a pigs ear once a week. How can i help her to put on more weight?
Should i feed her more?

Have a word with your vet or RSPCA first for advice. She may be at ideal weight or (gulp) she may have worms!

She been wormed (by the vet) and checked for worms. She's a staffordshire bull terrier so should be stocky.

I have put a photo on my profile but she looks bigger than she in this photo.

I can't see her bones, she just seems lean (not like most staffies), she seems healthy and well.

She looks lovely, and not thin (as far as you can tell from the pic). Perhaps she just isn't quite so heavily muscled as some staffies. Some of them seem a bit too stocky, I think.

There are so many fat dogs -- better a little bit lean than fat?

Thanks, i think im worried as my neighbour has a male staffy who is over weight and very solid, he makes her look so tiny, i suposse bithes are also smaller than dog's? She was tiny when i got her but was the same size as her brothers and sisters (not a runt) but she did come from a liter of 11

Realy worried that it might be a problem from breeding (after seeing things about this on tv). She's kc reg and i saw her with her mother but didn't see her father.