this is a good way to practise if you have the right dog, iv tried this a couple of times and my dog either goes for the golf club whilst your swinging it or just runs off with the ball and doesnt give it back
after all the comments regarding the behaviour of Mr Woods, i have just found this article on sky sports this morning
http://www.skysports.com/story/0,19528,12176_5484286,00.html
i dont play in competition, however i play with someone from work who plays off 5 and it has had a massive effect on my game. i have to agree with some peoples comments about spending time searching for the low handicapper balls.