Wintery treadmill action

I got my snow today!  Another winter wonderland for us out here this morning.  It changed to freezing rain and wind in the evening, but hey, I cooked chili and made the best of it.  I do like winter ... for a little while, at least.  Life without seasons would be very bland.

Took some video of the dogs on the treadmill today.  We've had it for 3 weeks or so now.  We haven't used it every day, but the dogs have had enough exposure to pretty used to it by now.  

Fenwick is just as crazy about it as ever while Brisbee continues to surprise me with his ever increasing enthusiasm.  Poco is still figuring it out as she tends to take her time with this sort of thing in general.  She also doesn't want to 'pull', so this keeps her to a more sedate trot - which isn't a bad thing!  But she doesn't quite have the confidence I would like to see, nor does she particulary seem to be enjoying it, she's just humoring me for now.  I still have hope for her, you can't rush Poco, she will do things in her own time.  London also hasn't quite figured out exactly what he wants to do, while it seems very natural for Fenwick and Brisbee, London doesn't seem quite as consistant with what he's doing.  London really has more enthusiasm than style.  In this video it's at the end of his 3 minutes and I was just screwing with him seeing what he would do if I asked him to find the 'space monkeys' (ceiling fan) while he was on the mill.  I'd like him to learn to use that energy he puts out towards the ceiling fan for something constructive.
I've been researching dogs and treadmills a lot this weekend, since my border collie has started showing some destructive behaviors that make me thinks he must be bored during the days. I'm thinking he must need more exercise and stimulation. It surprises me because I figured he would play a lot with my other dog--a retriever and wirehaired pointer mix--who is energetic and social and who loves to play, but apparently she mellows some during the day when I'm away, and he has started digging lots of holes (when the weather is good) or sometimes gnawing on my new crabapple tree, and now that it has turned cold, he has started tearing/digging a hole in the wall of the corner of the garage. Have you noticed a change in behavior since getting the treadmill?
Re: interesting
I haven't noticed too much of a change in behavior with the dogs, but they have a pretty active lifestyle as it is. I do feel it's an excellent workout, so if your dog's issues are related to a lack of exercise it can only help!