We rescued a dog from the streets (a Yorkshire Terrier/Shih Tzu mix is our vet's best guess) who we've struggled with since taking her in. At first we experienced issues with her being protective of our dog who we've had (a Boston Terrier), but all initial behavioral patterns have ceased except her tendency to pee in the house when we're gone.
I strongly believe she simply has a small bladder, because at times we've come to realization the bed was wet, but her fur was as well, leading us to think she wet the bed unintentionally. However, there has been instances where we've taken her out and returned an hour later to find pee on the floor, so I'm sensing perhaps a separation anxiety. I will also note that she is especially attached to me and follows me everywhere I go, even if it's from the bedroom to the bathroom and straight back to the bedroom - she even wakes up to follow me.
Our other pet, the Boston Terrier, is a chewer, so we give her toys to satisfy her but if we forget to take the trash out before we leave she will get into it - and so Piper (the Yorkshire Terrier) has adopted the bad habit. Moreover, I believe Piper to be the one that has been chewing through laptop cords and phone charger cords - a behavior that seems evidently deriving from nervous or anxious behavior.
I need to know what to do to train her - and Steevie, the Boston, for that matter. I've been told negative reinforcement is not the way to train a pet, and that proved true when I potty trained Steevie. Piper is potty trained as well, but I can't tell if she has a small bladder or acts out (her vet said she's fine but I have yet to specifically ask about her bladder). We are thinking to put a diaper on Piper before bed but we can't go around the house, unplug all electronics and hide the cords every day before we leave for work - that's a bit much.
Both dogs are around 3 years old.
What should I do?