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Of course its not ok for a dog to chase somebody. I doubt any owner wants that.
A couple of years ago, my whippet puppy "chased" a passing jogger in a park. He was tiny at the time and was just overexcited to see somebody run past at that moment. Poor guy had a total meltdown, was very afraid of dogs. We had a long chat afterwards...he genuinely thought my puppy was going to kill him. Obviously a really regretable situation.
Edit: Scrub that, there are lots of cunts in the world. I'm sure some owners enjoy it.
Not very constructive tbh, but whatever floats your boat.