Caro
Moderator
Just out of curiousity:
Are you sure he wants to come in as opposed to wanting you to come out? Maybe he wants to play outside? Jake would be outside all day long if we let him and often takes his time coming back in.
Yes, it does sound like he wants you to come out. Deska went through a stage when he would bark and then I would go outside to get him and he would turn it into a game of chase, even tho I would be fuming.
Firstly, Rommey is still in adolescence so part of it may be that crazy phase they go through (Deska settled down after a while). Plus, could be winter cabin fever.
If he doesnt come in straight away then leave him outside. It gets boring outside alone, eventually. I wouldnt use treats to entice him in, I would only give him a treat when he comes inside. Atm you coming out is probably more rewarding than a treat. Also when he comes inside play a little game with him. If its attention seeking behaviour then give him the attention when he is inside, make it fun to come inside. If you want to entice him inside then open the door, ignore him but start playing a game or rolling a ball, squeaking a toy inside - show him that the fun is inside the door not outside.
Can't help you with the long line, mine have access to a dog door when I let them outside. But when working on Deska's outside barking I put a short lead on him (just short enough so it doesnt drag), so it was easier to catch him - he gets dragged inside without a word so any attention seeking behaviour isnt rewarded.
One other thing. I whistle my dogs inside - they respond really well to a whistle (i have a special 'come' whistle). Train them to the whistle the same way you would train a clicker. Start by whistling and then giving a treat to 'charge' the whistle, then, if it is winter try it inside the house first - when you are in another room whistle to him and when he comes, give him a treat. Once he is responding every time you can move it to outside and try whistling him in.
Good luck.