Spot on, i never thought to ask those questions as i'm tired
Automatically assumed he had a mature/fit bitch to start with.
Yeah mate, as C/G says, you may have to change her food for a lower protein diet but keeping an eye on her weight and adjusting feed accordingly combined with plenty of excercise and you wont go wrong.
I've had a couple of bitches speyed in the past and they never got fat (non-working pets so lazy f*ckers as well)
LoL shazza i know that feeling!!