Their security deposit is $1,400 and they paid a $300 non-refundable pet fee."

I don't know of any online forums specifically for those severely allergic to pets, but there are for those who have fragrance allergies.

The yard is not secure, and may not be used as an enclosure for pets.  

Also, ensure that they are in compliance with lease terms, i.e. if they have pets, is this allowed?

We also have a "no pet" policy were a couple tenants brought in pets that caused issues. 

Figure out how you will handle an abandoned rental with no notice, $5000 in floor damage from an unauthorized pet, or complaints of mold.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

They already are given their utility allowance on a debit card instead of via direct payments to the utility companies, and lo and behold, none of them magically ever have enough money to pay their utilities, but they have plenty to host parties drink smoke get llegal pets that trash the place far beyond what the security deposit covers...so I can't imagine how much money is getting pissed away in Florida.