I introduced mine pretty much as soon as possible. My springer has a great temperment anyway, so I knew there wouldnt be much of a problem - basically she just followed the pup (Daisy) round, wide-eyed ("what on earth is that?!"), for about an hour or so... Daisy however just looked adoringly at Jazz, and followed her every footsteps, which quite soon Jazz came to like. It worked out fine for me, but I know that it doesnt always. I always supervised them together to make sure everything was under control, and they didnt start sleeping together in the same place until I was absolutely convinced they were fine together, which was about 1 - 1.5 months later.