They'd get so mad, that it made me think there was a strategy to get us to eat the costs.

Call animal control and report an agressive dog 

Many of the issues that eat away at cash flow come from not having reliable boots on the ground.

And 2) It is like saying...Everyone eats food, so food has huge competition, so it is better to start eating rocks!

Humans cats and dogs, goldfish, tweety birds, not horses or other farm animals of any type.

If you are only making $600 a year - you can easily call that negative cash flow - because the first repair you have to make will probably eat that amount up.I would encourage you to compare whatever deal you are looking at to alternative uses of your money as to investments.  

The hold harmless agreement is another animal in itself.

Removes the question of "where should be eat/go".   

Animal control was called, and I decided to issue a 10-day notice for the tenant to remove the dog.The tenant with the dog is now upset because they want to make things right with the injured tenant, who is refusing to have any contact with them.

If you go into a deal without having the financial means it will eat you up and spit you out before you know it.