Why toys turn friends into rivals
Two dogs can share a garden, a sofa and a water bowl happily and still clash over one squeaky toy, because toys combine everything worth arguing about: movement, sound, possession and your attention. Guarding usually builds through small moments, a freeze over the toy, a lip lift when the other dog wanders close, a low growl that works and gets repeated because it worked. Visiting dogs raise the stakes further, since your dog has no shared history of fair play with them. The aim is not to teach him that toys do not matter; it is to stop rehearsing confrontations over them while you build recalls and swaps that give him a better-paid option than defending his prize.
Remove the prizes while dogs are together
Management comes first again: when dogs are together, the favourite ball, the prized tug toy and anything he has previously guarded are put away entirely. Each dog enjoys those items alone, in separate spaces, so nobody practises guarding and nobody practises stealing, both halves of the argument. For group play, offer abundance instead of scarcity: several identical low-value toys, more toys than dogs, spread widely so possession never concentrates around one object. If he fixates on a single item even among plenty, that item joins the separated list. This stage feels like avoiding the problem, but it is what stops the habit deepening while the skills below are built.
Pay the recall away from the toy, every time
The skill that keeps group play safe is a dog who leaves a toy gladly when called. Practise away from other dogs first: while he holds a low-value toy, call him with genuine enthusiasm, pay a treat far better than the toy is worth, then let him go back to it, so leaving the toy usually means returning to it richer. When that is solid, use it during supervised play at moments when he is relaxed, not as a test when he is already hovering and tense. End play sessions while they are still easy, with a cheerful recall, a treat and toys collected calmly by you, rather than waiting for the first hard stare to call time.
Read the early signals and know your limit
Learn the pre-argument language: a dog going still over a toy, placing his body between the toy and the other dog, eating or chewing faster, showing the whites of his eyes or staring without blinking. Any of those means the game ends now, dogs separated kindly and without grabbing collars in the middle of tension. If guarding has already produced a fight with injury, or your dog guards toys from people as well as dogs, bring in a qualified behaviour professional rather than staging more practice, and keep dogs fully separated around toys until that help is in place. Consistency between everyone who lets the dogs out together decides whether this sticks, and KinsLe supports it with Care Teams, where the list of separated toys and the recall practice can be shared and marked done, so every supervisor runs the same play session.