There's very little consistency with this and varies based on the type of loan/property and like everything else changes frequently with market volatility. 

BRRRR stands for buy, rehab, rent, refinance, repeat.

In any case, do more frequent inspections when animals are in the home and charge for damages as you discover them.

I plan to purchase with cash then go back in and BRRRR them, get a refinance and buy the next house with cash and repeat. 

You could do more frequent inspections, but never expect your rentals to be the same as your personal home.

Near 0% rates. 3) The forces of quantitative easing were a huge tailwind 4) The stock market went up nearly 4x 5) Unemployment fell from 8% to 4%. 5) Banks were lending prudently 6) Investors were cautious and very prudent in searching for the right deals vs getting in because of FOMO. 7) We had massive foreign investment from China that got channeled into major coastal markets which drove home prices and equity values.8) Dodd Frank was in place 9) Tax laws were more in favor of Home buying None of these trends are likely repeat at the same magnitude as the last 8 years.

Or just a business line of credit. another idea is rinse and repeat.

I always signed a 12 month lease for the properties I stayed in, you could allow subleases if a tenant does not want to do all 12 months. 6 months just makes it a bit more frequent of turnover and more work, depending on what you are comfortable with even with the help of a PM.In my experience and what I heard from friends, for the most part, they were unfurnished.

There is a big difference between someone who can mortgage a rental property and someone who puts these deals together frequently.  

If you are buying/renovating  rental property using  HELOC,  you refi THIS property, pay off the loan ... and Repeat!