I'm going to let my brother know, I don't want his dog over to my house.
Why don't you want the dog over?
The dog is not well-behaved
You should tell him that before he makes that decision of putting the dog in the car before it is too late. I am sure he will understand for not wanting a dog inside your house. I would too.
I'm going to tell him the next time I see him.
I'm glad, it's the right thing to do. I hope he understands!