I don't think you have to wait till spring at all but I agree with TR on the wings and stuff when the dog is 1/4ing off rope, but on a check lead you can do several things with dead birds pointers or flushers.There is plenty of things you can work on through winter. Yes you don't want to rush it, there is plenty of small steps you can take. It does not hurt to wait with flushes for awhile and not rush the dog, but at the same time if you are at a point coming up soon, and the dog is at the stage where going forward is what he is ready for you might as well do it. If you don't have a good Idea of how to go about it then getting some help is a good Idea. You are the one that has to read the dog and determin what he is ready for. You have to have confidence as well. If you would like some help PM me and depending on where you are I will be able to get you some good help. Pics of the area set up that works great for that stuff coming yet, We trained three pups about 4 months old in it yesterday afternoon and it was bennificial for them. I'm having trouble with the software on the new windows 7 I installed, gota get that figured out to put up pics.. How is the dogs delivery? if he is running around and stuff on you maybe that is something to work on. That is nice to have that fairly solid before too much field work too.