For a legal service dog, you cannot charge a pet fee or deposit or pet rent because a legal service dog is considered an appliance, not a pet.

You had 5 dogs before the stray and her 7 new puppies came. 

In MA, you can usually get insured with Fair Plan with certain pets, but it is VERY expensive.  

We have allowed DOGS since we started in 2017.

You HAVE to allow pets.

Normally, we would say no and wait until the end of the lease but due to the situation and hardships we would inspect for pets and pet damages.

Cat odor is far more problematic than a small dog, but I would check landlord references to confirm how they've maintained their last residence.

That unit with the waitlist is the only pet-friendly home (duplex) with a fully fenced-in yard accepting more than 1 pet, including larger animals. 

because I was paying my bird-dogs vs having them pay me and just promise how someday, maybe just maybe they will bring the grand-slam of a deal and then I will be paying them oh-so much $$$$$ Seriously, from those buying into this I gotta understand how your mind works, no insult meant, I am genuinely intrigued and baffled because if it's a good deal you can go to any number of investors and get $, not a one will charge you for the opportunity to present them deal. 

Imagine someone harassing your girlfriend, damaging your property, using or selling illicit drugs, dog biting you or your other tenants and creating a flea or noise issue, or any number of other potential issues.