If you don't, the next seller (ie the person buying your flip) will have an inspection done and then ask for $ to cover a new septic. 

Don’t skip a professional inspection of the property, as there could be hidden issues such as structural damage or code violations.

Have a candid conversation about how he plans to handle representing both sides and ensure you’re protected with things like a solid inspection period and contingencies.

I gave her some runway to get her finances in order and although she can be a bit of a squeaky wheel, she pays on time for the past 2 months.As the person is still paying, I would just stay on them about the late payments, collect the late fees and inspect the property to be sure they're not damaging the inside.

The tenant left on her own but i was disturbed with how much the dog was barking just on a random inspection alone...

I had the house inspected when I bought it, and nothing really came to light about this. 

Especially so when taking over from another company mid-lease (do you do inspections of all units before taking over).

I will be there the following morning to pick up the keys and complete the move-out inspection."

Just make sure you to have an inspection period to review things more. 

I am curious about ifit's hard to get approved, how long it takes to find a decent tenant, your experience with inspections, etc.