Our neighbors didn't neuter their Sheltie until he developed prostrate problems and was dripping pee all over their house. It was a mess. Another thing you have to be very careful with, is that when there is a female in heat anywhere near you, he will go crazy, so to speak.

He'll want to get out the door any chance he gets and find the female. Scary.
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Joanne

Eli

Chipper

Eva

Snowboy

Rosie(R.I.P. 1996-July 29, 2013)

Cocoa(R.I.P 1998-April 26, 2012):