Shadow gets tired just walking up the stairs lol. She can usually handle a walk around the block and thats about it.

Micki is a little harder to tire out, I usually take him rollerblading and the little guy can pull me non stop forever!

Mini is tired after a 2 mile bikeride, she also loves to go rollerblading but doesn't have as much stamina as Micki.

Jack can go for a 2 mile bike ride to a huge open field, run off leash for a while and then the 2 mile bike ride home and is whipped but after a quick nap he wants to do it all over again.

Kyra can play fetch forever and never seems to get tired, or play frisbee, I don't think I've ever seen her completely worn out.