My 5 month old is 6 weeks away from starting his collar conditioning and force fetch. I am positive about the 6 weeks because he has lost three teeth as of yesterday and baseball season ends in the middle of May!!! How do you prevent your dogs from becoming collar-wise...if there is such a thing? Do you just put it on him/her everytime you take him out of the kennel? I have heard that some people actually leave it on them for a week or so at first and then start taking it off at the end of the training sessions. I plan to start TOMORROW putting it on him whenever I take him out of his kennel, and then removing it when I put him up...unless, of course there is a more "proven" way that some of you may know of.