Others treat both small and larger animals, and some treat only large animals, such as cattle and horses. Veterinarians in companion animal medicine provide services in 20,000 animal hospitals or clinics. Veterinarians for large animals treat and care for cattle, horses, sheep, and swine. They also advise ranchers and farmers on the care, breeding, and management of livestock. Others specialize in fish and poultry.
Veterinarians contribute to human as well as animal health.
A number of veterinarians engage in research, food safety inspection, or education. Some work with physicians and scientists on research to prevent and treat diseases in humans. Veterinarians are also in regulatory medicine or public health. Those who are livestock inspectors check animals for disease, advise owners on treatment, and may quarantine animals. Veterinarians who are meat inspectors examine slaughtering and processing plants, check live animals and carcasses for disease, and enforce government food purity as well as sanitation regulations.