When I went to Puerto Rico the host requested an ID plus picture of my vaccine card and I didn't think twice and showed it.

For one, this recession was really self-inflicted meaning that as soon as everything opens back up, hopefully after a vaccine, it should generally mean business as usual.

In the case of a SA or ESA, you as the landlord has the right to verify the SA or ESA, by request to see documentation and call to verify with the provider to make sure the certification is legit, valid, active and current, and wellness documentation that the animal is in good health, free of parasite, flea, ticks, vaccinated etc...

I would also request a VERY detailed background history of the dogs - most people who are trying to "beat the system" don't go the whole 9 yards of building a credible vaccine / vet check ups report.

Your Animal agreement should cover licensing, vaccinations, a photo of the pet, flea control, instructions on waste disposal and an inspection schedule. 

It is also recommended that the LL have an ANIMAL -- not pet -- policy covering care, animal waste, vaccinations, insurance, inspections and damages.I would inspect and immediately charge for damages. 

@Tim Bartel any cat or dog over the age of 1 year is considered an adult and at that point several behavioral problems have been corrected and they should largely be up to date with pet vaccinations.

Still waiting for that vaccine to hit the market.

I attach this to the lease and it covers all aspects of owing a pet including vaccinations etc.

Require them to provide documentation that their animal is licensed, vaccinated, and flee free2.