I'm bummed that you didn't get any replies as this is a subject I'm curious about. The articles I've read on the subject of singletons haven't been very flattering in regards to how a singleton's temperament will develop since they lose out on a lot socialization skills w/o littermates. Although some articles did say all is not lost if the breeder is aware of this and is involved in giving them a good headstart. I'm glad your boy is doing well.
Rumi vom Haus Barrett 8/24/2010 BRAT, HCT, CGC
Dakota GSD rescue 7/1/00 - 9/15/11 CGC, RA, CD
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Gunnar GSD/greyhound rescue 1995-2005
Kodi GSD/husky rescue 1991-2004
Cleo, pug and Happy, mutt from childhood