A sock goes missing. Your dog appears in the doorway with it, looks straight at you, and waits. The moment you stand up, they are gone down the hall.
This is not defiance and it is not a training failure. It is the most reliable game your dog has found, and you are the other player.
Why the chase is the whole problem
Your dog is not keeping the sock because the sock is wonderful. They are keeping it because holding it makes you get up, make a noise, and run.
Behaviour that gets paid gets repeated. Reward-based learning is how dogs learn everything else, and it is also how they learned this.
Adolescence, roughly 6 to 24 months, is when this shows up in earnest. Your dog is faster than you now, bored more easily, and less responsive to your cues than they were at 5 months old. That drop in responsiveness around the onset of adolescence is developmental, and it lifts again later in the stage.
This is not the same as guarding
If your dog stiffens, eats faster, freezes or growls when you come near the stolen item, that is a different problem with a different plan. It is linked at the end, and it comes first.
Keep-away is a social game with a happy face on it. Guarding is a warning. Read your dog's body, not only the sock.
Tonight: stop paying for it
Do not chase. Not one step. Standing still and looking bored is the single most useful thing you can do this week.
Do not lunge, grab, or wrestle it out of their mouth. Both of those are still contact, and contact is the game.
Do not shout their name across the house. You have joined in, loudly, and their name gets a little cheaper every time.
Sit back down. If the item is harmless, let them carry it around for 2 minutes with no audience. Most adolescent dogs drop a sock nobody wants.
Management does more than training here
Behaviour change is built from management plus reinforcement together. The management half of this one is laundry, and it is unglamorous and very effective.
Laundry basket with a lid, off the floor, behind a door. A pile on the bathroom floor is an open invitation left out overnight.
Shut the bedroom and the bathroom. Two closed doors remove more stealing in a day than a fortnight of correcting does.
Get the school shoes, the dish towels and the bathrobe belt up off the floor at the height your dog can reach standing up.
Put 3 of your dog's own items where the socks used to be: a chew, a stuffed toy, something to carry. Carrying is a real need in some adolescent dogs.
Tell everyone in the house. One person who thinks the chase is funny keeps the whole thing running.
Then teach the trade, before you need it
Practise with items your dog does not care about, at a calm hour, when nothing has been stolen. The trade has to be an old habit before a real sock is in their mouth.
Hand your dog a boring item to hold, like a clean rolled sock they have never had.
From 6 feet away, say one cheerful word, then scatter 5 treats on the floor away from them. Do not walk toward the item.
While your dog eats, pick the item up calmly and walk away. Five reps, then stop for the day.
Separately, pay your dog for bringing things to you. If arriving with a sock gets food and no confiscation, arriving becomes the habit instead of running.
Teach a run-the-other-way game: call, then run away from your dog and scatter food where you stop. Chasing you is allowed to be the fun version.
Reward-based training is associated with higher reported responsiveness and fewer reported problem behaviours, which is the whole argument for trading rather than taking.
Do not tell your dog off once you finally have the sock back. Punishment-based approaches are associated with fear, avoidance and defensive aggression, and a dog who expects trouble on arrival stops arriving.
Safety note
Call your veterinary practice now if you think anything has been swallowed. The same applies if you cannot account for a whole sock, a toy part, a hair tie or underwear. Say what it was and how big it was. Do not wait for vomiting and do not make your dog sick at home. The same call applies to a cooked bone, a corn cob, medication, batteries, or anything sharp. If your dog growls, snaps or freezes over held items, stop this plan. Speak to your veterinarian and a qualified behaviour professional who uses reward-based methods.
What to expect
Owners usually describe a quieter house within 2 to 3 weeks, with the odd relapse on a day the laundry got left out. The game fades because it stops working, not because your dog decides to be good.
If this is one of several adolescent things going on at once, the Assessment will sort which to work on first. It is free, takes about 3 minutes, and asks for no email address.
Today's version, in one line: lid on the laundry basket, and the next time a sock appears, stay in your chair.