Must admit, 17kg is rather light for a male bully, My sisters female weighs in at 29kg, she's one heafty lump, one of my females weighs 24kg and the other 27kg.
But as myself and every1 said, try tripe, I know what you mean about the smell tho, It makes my daughter feel sick bad and my son just heaves at the smell of the stuff, i've got used to it now but i do feel abit shown up when people knock my door and iv'e only just fed em lol.


Oh yes, as carol said, pasta is good for weight gain aswell, i feed that often to mine and they love it.
A £250 pound bag of pasta last me a good week or more for 3 of my dogs.

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On guard.