So maybe focus on doing research to discover new drugs and then sell those to an existing drug maker. https://ahi.org/approval-and-regulation-of-animal-medicines/#:~:text=A%202015%20study%20of%20the,new%20pharmaceutical%20product%20for%20livestock. says it takes 6.5 years and $22.5mil to bring a new drug to market. https://www.fda.gov/animal-veterinary/animal-health-literacy/idea-marketplace-journey-animal-drug-through-approval-process outlines the approval process.
Also, to develop medicines, you may want to focus more on pharmaceutical sciences, pharmacy, biology, and chemistry rather than becoming a vet.