Clinton Morrison grabbed a late equaliser for MK Dons to cancel out Wes Thomas' brace for Bournemouth.
Angelo Balanta put the hosts ahead when he volleyed home Dean Lewington's cross at the near post.
Thomas drew the Cherries level with a header from Warren Cummings' free-kick before making it 2-1 after a dreadful error by Dons defender Gary MacKenzie.
MacKenzie made up for his error late on - knocking down for Morrison to bundle in from close range.
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MK Dons manager Karl Robinson told BBC Three Counties Radio:
"We work so hard to create opportunities, which we did today. There was some really good passing but when you look for the killer instinct, it wasn't there.
"We don't defend poorly at set-pieces, we work on them religiously and it hurts me that it was a free header from six yards out. The other goal was just human error.
"I wish we were more clinical, whether that's shooting, passing or defending - more clinical and ruthless."
Bournemouth manager Lee Bradbury told BBC Radio Solent:
"Not many teams come here, go one down and then 2-1 up.
"I felt we were good enough to keep hold of the lead. I thought in the second half we were the better team.
"He (Wes Thomas) works really hard for the team, he does a great job for us and he got his just rewards today."