Just About Jacks

And obdience trained, but all of a sudden, he has started to do his businesses in the house. At nightime, during daytime, right in front of us, we respond by yelling and grabbing a leash and taking him outside, but he can do this and come right
back in and do it. Do yuo think after he gets nuetered this will stop.

I have 2 cats (both 2years old and 16 lbs each). I would like to get a Jack Russell puppy. Can Jack Russells be trained to get along with cats? Or would my cats be in danger?

I don’t think it should but the person I am living with does, he only thinks so because he is a little over him crying through the night and ****** and pooing everywhere.
I think that he is too young, and am trying to toilet train him, what should I do?
Is he too young?
(BTW I named it Gizmo, since I think it looks like a gremlin)