On Feb 10th, 2022 NY Governor Kathy Hochul lifted a mandate that required either masks or proof of vaccination for indoor businesses serving customers.
You still have the legal right to continue to require the public to wear masks and/or show proof of vaccination when they enter your business. You can use wording like this to explain your decision:
"There is a high-demand for veterinary care at the moment, together with significant staffing shortages, so we are taking every measure we can to ensure we don't have a COVID outbreak that might shut us down for a few days.
If we had to close, nearby animal hospitals don't have the additional capacity to care for the animals that need our services. The health of our animal patients is very important to us."
Or if you choose to continue curbside check-in you can use or adapt our customer flyer. It is attached to this post.
Also note that the NY HERO act remains in effect for now, although it will be reviewed very soon. The mask/vaccine requirements that were lifted protected customers, but the HERO act protects employees. You also have legal and ethical obligations to provide a safe working environment following guidelines such as those provided by the CDC. For many animal hospitals this will mean that the use of curbside check-in remains the best option.