He does this when I'm parked in my car on the phone aswell. He will stand in front of my car saying his pup wants to see me. I've gotten to the point I just ignore and continue on my phone conversation

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Sounds like a classic case of someone who has difficulty finding “hints” in others, and is socially unaware. As annoying as it is, he seems like a man who is happy to see how excited his dog gets when he sees you. Instead, you could let him know that you can come see him and the pup at more convenient time for you. With people who are socially unaware, just talking to them directly and letting them know that it’s not the right time is more than enough.
So people might seem perfectly and fully competent, yet be socially unaware. Sound like he might fall into this. Or maybe as @20yearsoldier said, you might be his only pleasant social contact.
Just taking a guess, he's very lonely and you've been very kind to him. You may be the only positive interaction he has all day.
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He sounds like he's old and lonely, despite his family.
He's socially unaware but left when you explained that he was bothering you. He wasn't intentionally being rude.
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