Oh, nothing wrong with this (he said sarcastically)
A possible solution is to create vaccines that spread themselves through an animal population.
These “self-disseminating vaccines” can be developed in at least two ways. The conventional approach relies on applying a vaccine to the fur of captured animals and releasing them. When these animals return to their natural homes, social grooming results in the vaccine being ingested by other individuals, magnifying the level of immunity that can be achieved.
I think with the spreading of the spike protein, we are already there.