No, no it's NOT normal behavior for ANY dog.
It is typical behavior for a dog that has been given no training, no outlet for its energies, and no structure.
It's also behavior typically seen in dogs of all breeds owned by people who don't give a damn about their companion animals.
I can't even imagine what the smell in the house is like if there are 18 cats.
Realistically, you can't do anything to the dogs in the limited amount of contact you have with them. Remedial training, regular exercise, care, and attention over a long period of time is the only thing that's going to cure this.
My parents have a lab that was largely in the same place as these two. Magic was an outdoor dog, and largely ignored, when my parents got him through a rescue. It was a tough time for awhile, because he had no training, little socialization, etc.
He's still a bit on the hyper side, but he's been through training, he knows how to appropriately interact with other humans and dogs, and he's turned into one hell of a fine companion animal.