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need advice about my dog and obedience?

Took our dog for a walk today at the family park (dog park), we usually let him off the leash because he has always been very obedient and always came back when we call for him (yes this is allowed at the park). Our dog loves everyone especially dogs (not what u would call a guard dog). Today when we let him off the leash a person came up with her dog and introduced her dog to ours. We waited for them to get very far up the trail then let our dog of the leash again. Our dog went running at top speed (ran at least a quarter of a mile), would not listen when called and only stopped when he caught up with the other dog owner and her dog. Now my question is how can I get him to listen and not run off like that when other people and their dogs are @ the park w/out having to leash him?
yeah he is fixed he just really loves to play with other dogs

you need to go back a step and proof your dog to the recall before letting him off leash again. Use a long line. Let him loose on it, call him, if he doesn’t come, correct him and make him. As he learns that ignoring you is not an option. Add distractions, such as other dogs.

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