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From Wikipedia: Players assume the role of a veterinarian running a pet clinic and must heal sick pets back to full health. At the beginning of the game, this involves treating smaller pets such as guinea pigs, hamsters, rabbits, and birds. As the player gains experience, larger animals such as horses, dogs, or cats become available. The clinic's facilities can be expanded and altered (for instance, the style of kennels used to house the animals). Expanding facilities enables more pets to be housed and increases the range of treatments available. Players are also responsible for managing the clinic's finances and supplies