A smaller number of private practice veterinarians work exclusively with large animals, focusing mostly on horses or cows, but may care for all kinds of food animals. These veterinarians usually drive to farms or ranches to provide veterinary services for herds or individual animals. Much of their work involves preventive care in order to maintain the health of food animals. They test for and vaccinate against diseases, and consult with farm or ranch owners and managers on production, feeding, and housing issues. Veterinarians also euthanize animals when necessary.
Veterinarians contribute to human as well as animal health.
A number of veterinarians work with physicians and scientists as they research better ways to prevent and treat human health problems such as cancer, AIDS, and alcohol or drug abuse. Some test the effects of drug therapies, antibiotics, or new surgical techniques on animals. Veterinarians who are livestock inspectors check animals for transmissible diseases, advise owners on treatment, and may quarantine animals. Veterinarians who are meat, poultry, or egg product inspectors examine slaughtering and processing plants, check live animals and carcasses for disease, and enforce government regulations regarding food purity and sanitation. Some veterinarians care for zoo or aquarium animals, or for laboratory animals.