You should immediately contact your attorney and local city department of health department.  

Do I need to do anything about it to protect my health?

Not too bad to fix but can be a pain.  

And once the puppy starts teething, it will start chewing on things to stop the pain/itching, which can very likely be doors and trim

Letting that go will only cause more damage to your property every time it rains (wood rot, mold, damage to pain/walls, etc).The windows are a high priority item that you can wait and save up for, hopefully in less than a year.

So, I feel the pain. 

I wish you great health and waelth.

Unless it's an extravagant piece of equipment that you specifically say "if this breaks, I'm not fixing it, you just won't have use of it anymore", the tenant should have a reasonable expectation that everything that's in place when they move in should continue to work and stay in good health.  

Is my health kinda bad and I have a different use for the money now?  

And just as many that specialize in turn key sales .I would not get to focused on one area until you have explored much of the US markets first.things to consider when owning rentals of course is the city health and demographics and long term projections.. and the other big issue especially with older rental stock is long term Capital expenditures to keep said homes in decent shape.. there is a sweet spot for rentals IE sq ft of homes and bed baths..