There’s a good three part radio series from the Center for Investigative Reporting and PRX about how drugs for pets sourced from grey markets played out with the FDA:

[index] https://revealnews.org/podcast/cat-drug-feline-infectious-pe...

[1] https://www.hyperfixedpod.com/listen/hyperfixed/the-cat-drug...

[2] https://www.hyperfixedpod.com/listen/hyperfixed/the-cat-drug...

[3] https://www.hyperfixedpod.com/listen/hyperfixed/the-cat-drug...