I have a 10 month old border terrier. He's a fabulous dog, daft and silly and playful and lovely with all dogs and people and children. He wants to make friends with everything, we adore him.
But OMG, he's so needy and nothing satisfies him! I'm an experienced dog owner so I'm trying to work out how I've made him this way.
I WFH full time at the moment - have done since we got him in March. He currently gets 3 walks a day, 1x50 mins off-lead, and 2x15 mins on a lead. I have frozen kongs on the go constantly, he has 2 small ones per day.
He has two half days a week at doggy daycare, where he plays with other dogs and wears them into the ground for 4 solid hours which includes a 1hr walk with them.
He has free access to natural chews whenever he wants them (antlers, dried tendons etc).
He has a girlfriend over the road and they have a walk and a play together a couple of times a week.
We have a game with him every day early evening with a toy (usually on his terms, i.e he has the toy and we chase him in circles), or do a bit of training if only basics, or hide the treat etc.
But in the day while I'm working, he cannot settle for more than a few minutes at a time - even when he's been running around for 4 hours after daycare! I'm in an office upstairs where he has a bed, but he paces from our bedroom to office to landing to downstairs. He'll wander out of the dog flap into the garden and bark at nothing, gallop back upstairs and start pacing again, whining and hooting for good measure. He never seems to lay down and go to sleep - he usually doesn't crash properly until late evening, when DH and are finally in the same room together doing nothing - then he might have a chew and fall asleep eventually.
Today he's had his short morning walk, breakfast, a kong, and been offered his chew - but he's sitting in his bed staring at me in the mirror, waiting for me to move a muscle so he can leap to his feet. It's not even 9am and I've barely started my working day - I won't take him out again until 12.30.
He'll be pacing, fussing, whining and hooting all morning, even if I totally ignore him. I just feel constant guilt that he's bored and has a rotten life. 
I wonder if he's "over stimulated"? Is that thing?