Boomer is still a little cutie pie!!  The hair will grow back ... I would keep an eye on it ... if he gets those prickly hairs near his eyes it can cause eye infections!  That's why I got so mad when the groomer shaved up the middle of Toto's nose!!   

   That was months ago and it's still not completely grown back!!  Same thing with her little "private parts" ... I don't know why they have to whip out those clippers unless it's quicker!!  I figure it takes a little more time to just snip it close with scissors ... but, when she is shaved there it causes her to scratch and scratch!   
If I were you, I would continue to brush him every day just as though he had a long coat!  That way he will still be accustomed to brushing and will look forward to it!