I should say that I've never actually asked the breeder for assistance with Rosie, but I did mention her problems in an email I sent him (just an update email with a photo for him) and he hasn't replied to the email (it's been over two weeks). I haven't tried again, so it's not as though he's repeatedly ignored me.
Personally, I just think she has a sensitive tummy, I don't think it's anything to do with the breeder. But after seeing what some breeders on here are like with after-care, it struck me that if I ever did this again, I would be far more careful about the questions I asked and one of them would be about their insurance (he certainly never mentioned 4 weeks free insurance, like Kendal has mentioned on another thread) and another would be about what after-care he provides. I had no experience of breeders and no idea what to ask - I'd be better informed next time (if my husband will ever let me have another one!)