Good discussion! I used to hear the 'brains being bred out' way back in the 70's. It's kind of like a rumor that came from a joke about the narrow heads. Not true! I've had collies for 35 years. My last four were therapy dogs over the past 17 years. They're wonderful dogs and I find them to be very flexible when it comes to energy. If there's a dog party or playtime, they're ready and willing. When it's time to veg-out, they're perfectly happy lying at your feet, all day if necessary. I have done the therapy dog work, conformation, obedience, flyball, rally, and most recently dancing. You should see my Bailey dance! So much energy. But he can be a lazy boy, too. They're great dogs, but they do have a barking issue, especially if left outside alone.