Okay kiddo, so Connecticut v. Doehr is when a man named Harold Doehr had his house taken away without being told it was happening. This happened because someone he owed money to got a court order that said they could take his house as collateral, but they didn't have to tell him they were doing it.
Now, Harold didn't think this was fair, so he went to court and said it was against the Constitution to take his property without telling him. The court had to decide if it was okay for the law to let someone take someone else's property without warning them.
In the end, the court said that it wasn't fair to take someone's property without telling them what was happening, and that it went against the Constitution. That's why it's now a law that people have to be told if someone is trying to take their property in court.