Does anyone have a low energy sheltie who has been that way his/her whole life? Jet is 2 years old and rests at home a lot, on walks he often lags behind us. On walks he does get sudden bursts of energy but it's always when he chases after our other sheltie boy and tries to play with him. Pretty much the only time I see Jet use much energy is when he plays with Cosmo. I can't run with him, because all he does is trot. If he's not resting or sleeping, he's usually outside barking along with the neighbours dog. So yeah, anyone have a low energy sheltie?