Mine is ace – mad as a box of frogs and doesn't get anywhere near the physical exercise he should do. Follows you around a lot, lets you know what he needs… loves to play (and will collect the correct toy that you tell him to get – so long as he can remember where he left it that is, we are in a 3 story town house so it can go missing from time to time).
He keeps himself occupied mostly trying to herd our two cats. 1 of which is a teeny tiny moggy (well, she was – now a fat little cat) and the other is a HUGE Maine Coon. Jake the Collie and Ed the Main Coon get on really well together, probably as they are both so intelligent. I think Jake just wished they would play with him more!
I very rarely put him on a lead, my wife does a lot more than me (I just whistle to him to keep him close and on pavements). He charges around like a mad thing on the hills and in the woods, loves playing with sticks and is very hard to knacker out. Took him on the mountain bike when we lived in Scotland and only did a max 10ish miles but he would run flat out for the full ride, then fall into an exhausted heap for 10 minutes before wanting another go 😉
Ace dogs, so long as you get a good one and spend the time with them. Bit neurotic, but if they are occupied then they are fine – we can leave him alone for half a day without any problems (the cats keep him company – he will just gaze at them for hours if they are asleep!)
Ours was a rescue dog – had him for coming up 2 years and he is about 6 now I think.