Students who major in zoology spend a lot of time outdoors studying animals and their habitats. They also study the effects of humans on animals' environment and how to lessen these effects. Some jobs in zoology require an associate or a bachelor's degree, while others demand a degree that takes longer to obtain.
Every living organism needs a home, shelter or environment that provides the safety, ideal emperature and basic things it needs to survive. more science lessons: Asexual Reproduction
Some dogs are at the shelter because they developed a health problem that their owner couldn't (or didn't want to) deal with. A shelter dog with a health problem might need a special diet, or insulin shots, or daily pills, or surgery, or he might have vision or hearing problems.