Hi there, extendable lead for a Labrador??? Personally I wouldn't, if you think about it, having any large dog on an extending lead, teaches it when it wants to go a bit further that it can and when you then use a normal lead it will expect the same thing to happen and will be an instant puller.

Recall is the most important thing, practise it wherever you can where there aren't too many other distractions (sights and smells). Its important that when you are training with a pup that you achieve the right thing, so don't make any training too difficult so that you both fail. Sometimes give a treat when your pup comes back, and as they get older, gradually reduce the treats until they're not needed.

Pups do go from being very dependent on you and having a good recall, to a stage where they start pushing boundaries, which is why its important to get the basics in early on, and you will need to train again regularly to keep those basics in place, just a few mins each day is all it takes, I do ten mins each day with my two Lab girls, aged just under 3 and 4.

I've recommended it before and will recommend it again, a book by a chap called John Weller, 'A Simple Approach to Gundog Training' - a very good book to teach the basics, even if you don't want to train your dog to compete or work, its written in a very easy to understand language, I know because even i could understand it And even if you aren't planning competition or work for her, its a good idea to follow the training for retrieves, your girl will absolutely love it, and you will never need to use treats for recalls, the possibility of a bit of retrieving, whether with a dummy or tennis ball, will be much more of a reward.