When we got Roxi at 4 mo hers hadn't started to change yet, but now at 18 mo her coat is almost completely blue. We got Titan at 6 mo and his was starting to change. He is a year old now and he still has a lot of black mixed with his blue. So to answer your question. The should start to change during their first year (part the hair and look at the roots to see the blue coming in) and should be totally done by their third birthday (I think). You could check the admin's thread about coats I think it says something there about this.
__________________ Anna  & Roxy  |