Cinnamontoast
Fais pas chier!
And does it depend on breed/size? My ten year old runs round like a pup and has decided he wants to join in with gun dog training, he swims like a fish rather than run on terra firma, he's as active outdoors as the three year olds. He is very sensible and much quieter in the house, but that's just his nature.
Gratuitous pic:
Gratuitous pic: