Can a Felon work as a veterinarian assistant?

This will depend upon what the felony conviction was for. Regardless of the criminal history, a person can become a veterinarian by completing the curriculum at an accredited college of veterinary medicine. However, depending upon the conviction, the person may not be eligible for a state license to practice or to handle controlled substances like anesthetic agents. A felony conviction would make it more challenging for a person to work as a private practice veterinarian, but they could work as a public health veterinarian or for the federal government (again, depending upon the exact felony conviction).