I'm not really good at guessing age so lets here some opnions.
letemgrow PMA Member Oct 4, 2009 #3 looks 3.5 to me, his neck/shoulder area does not blend very well yet.
Gladiator PMA Member Oct 5, 2009 #5 I would say 3 as well (looks like his gut curves upward into his back quarters) Very healthy is right!
I would say 3 as well (looks like his gut curves upward into his back quarters) Very healthy is right!