This company calls it “capital stacking” but I have since found out that they’re calling it the wrong thing…credit or card stacking is what it is.

For quickie emergencies there are always the "18 months no interest" options at Lowes or Home Depot along with similar terms from your credit cards (those checks you can write for a 3% fee and then have 12-18 mos to repay). 

As long as you keep everything in a separate bank and credit card account, it should be fairly straightforward to track.

Also, note that a lot of the home improvement box stores have a credit card with 0% for 6 months. 

I am paying off a small LOC and 0% credit cards from the last property - this will take a few months.

But now he is staying so we decided to play the cat card, and told him that per his lease pets not allowed and if he would like to keep it we will need to amend his lease to include additional $100 pet rent plus collect additional security deposit.

They have an ID card with your picture on it so you cant even sneak in guests. 

I see they suggest offering the tenants the option of paying by Credit Card.

I usually suggest new property owners setup a business before they even close on a property and then use a business credit card for all expenses moving forward and also for them to link it to Quickbooks so everything is automatically tracked for them.There are a lot of nuances and strategies but this is a 30,000 foot view of why you should opt for business>personal

Much easier to delude one self into purchasing a "mentorship" program for $30,000 or more ("put it on your credit card; you'll make it back on your first deal so it really won't cost you anything") and believing that after a "3 day boot camp" you'll be able to compete successfully with people who have the education, knowledge, experience and track record and have been doing it for years.