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every once in a while he just looks at me and says 'fuck off' before running off to do what he wants
Oh yeah I know that look. Mine will only do it in a place she knows well like the local park but that look back then you can see the thought process "no I don't think I will". It's not got her in trouble yet, usually just there's something gross to chew or roll in but it's my sign that it's home time.
This lab is my dog (though mine is a 17kg sheepdog), i am slightly ashamed to admit. His recall is resonable, but every once in a while he just looks at me and says 'fuck off' before running off to do what he wants. He also loves to play, with anything and anyone. Once this was quite to the amusement of a big German Shepard's owner, who had never seen their dog play before and mine bit it's ankles and chased it about. Though he has had a few gnarls and knows when to back off - as when he met a Pyrenean mastiff the other week.
I could keep him on the lead at all times (I only let him off when we are in countryside or a dog park), but I don't, generally he is really good, but yes occasionally leaves me embarrassed and apologetic. Thankfully so far not vet bills for receiving a proper bite.