Think of this as a vaccination of sorts if your investment portfolio is small or you at beginner status.

She informed me that she does not care and that she is not "breaking any rules" because the animal is under the 35 lb weight restriction and will pick up the puppy in a week or two.I politely informed her that the partners and I find it unacceptable and that they must be vaccinated and have previous rental history or OK from another landlord.

Printing money + forbearance to avoid foreclosures + interest rates staying low for atleast 2+ years + a vaccine eventually will make real estate prices higher a year from now not lower. 

Vaccine starting in mid December and should be ramped up in Jan/Feb'21.

Rent: $1,295PM: - $129Insurance: $80Property taxes: $125Water bill: $65Capex, maintenance, vaccines: 15%: $195Cash flow: $701This lady was the craziest person I ever met.

Adhere to local ordinances, including leash, vaccination, and tag/licensing, requirements.3.

Are there other areas you recommend with less risk of vaccines? 

With my out-of-town units, I now require the tenant to step through many hoops if they want a pet, with vet records proving breed and current vaccinations, AKC canine good citizen certificate, proof of current pet license, liability policy with me listed as additional insured, and a much larger deposit (like 1.5 times monthly rent instead of 1 month).  

Our tenants have one dog who seems well behaved and with an up to date vaccination record.

You'll want to read this article:  https://www.thebalancesmb.com/is-a-landlord-liable-if-a-tenant-s-dog-bites-someone-2125072Without exception, you will want to require your tenants to carry Renter's Insurance and have a strong pet addendum - including a photo of the pet, breed (non-aggressive only), the pet's medical records to show all vaccinations are current, more...And, if a dog bites anyone (other than someone breaking in or the like), you will need to act to have the pet removed from the premises to ensure you do not assume liability.