
This can depend so much from breed to breed & bitch to bitch.
My first bitch on her first litter(7) went back really well &
could(I didnt) have been shown when the pups were 8 weeks. She was slower on her 2nd litter(5) by about 2 weeks. My most recent mum took longish but as she wasnt good bodily. I didnt take alot of notice as I hadnt any intention of getting her back in the ring by a certain time & had to concentrate on getting home for 6 dog pups.
None of my 'mum's' have had huge signs of having a litter & go back really neatly, with no long & saggy teats like some can have, which I have to say, for me, does ruin the overall picture in the show ring. Mind you I cant say as I have seen any of my breed with bad undercarriage in the ring.