It's a slippery slope. You can't test on people, and need animals that have similar drug kinetics. That being said, so much drug research is unnecessary garbage

It's a slippery slope. You can't test on people, and need animals that have similar drug kinetics. That being said, so much drug research is unnecessary garbage, and living beings pay the price. I worked in immunotherapeutics and gave cancer to ~25 mice. I can't say it helped progress the field much, and I still feel bad. Cannot imagine what it's like to give cancer to a dog.