I do let Fraser off leash, but only in places that are empty and I can see another dog coming from a distance. As Jane and Lily point out, they have to be off leash sometimes to teach them recall etc., quite apart from the dog's need to run about, snuffle and explore freely. Fraser's recall is pretty good (apart from one rogue event when he got freedom in his head and would not come because he was too busy trotting down the side of a condominium row, going into every garden and peering in through their patio doors, absolutely deaf to my calls.) It's the off leash dogs in supposedly on leash areas and their careless owners that make me so angry. I'm wary of Fraser ever being in a situation where he might bite another dog. I'm pretty sure in any past snarliness, it has been warning, not biting, but I now know him well enough to know he gets wound up when feeling defensive and assume that's not out of the question in heated situations. I wouldn't want to take any chance that he could harm another dog or get harmed himself, or even be reported if he did bite another dog. Which is why owners ignoring my attempts to indicate I'm not happy about their loose dogs coming up to mine make me so angry. In fact, I've just remembered an occasion when an off leash Westie came running up to Fraser, wanting to play. Before I could lock the leash (and extensible one), Fraser was off and while I was trying to sort out two dogs bouncing and chasing each other, his leash almost tripped an old man walking past.