Guinea pigs are highly social animals that experience significant psychological suffering when kept alone. Understanding their social needs is essential for responsible guinea pig ownership.
The companionship needs of guinea pigs are among the clearest examples of how inadequate the 'single pet' model is for naturally social animals. Guinea pigs evolved in social groups and have behavioral, physiological, and psychological needs that require guinea pig company to be met. A lone guinea pig is chronically deprived of a fundamental need. The vocalization system of guinea pigs - with distinct calls for contact, alarm, contentment, and mating - has no purpose when there is no one to communicate with. Swiss law recognized this reality by making single guinea pig ownership illegal. This standard should be universal.