Guinea pigs are highly social animals that suffer significantly when kept alone. Yet single guinea pig keeping remains common. Understanding their social needs is fundamental to responsible ownership.
The single guinea pig is one of the most common welfare failures in companion animal keeping. Guinea pigs evolved in social groups and their nervous systems are calibrated for constant social contact - the presence of conspecifics regulates their stress responses. A lone guinea pig, no matter how attentive its owner, lacks the continuous reassuring social contact that is physiologically necessary for the species. The pet industry's sale of single guinea pigs as 'starter pets' or 'children's pets' perpetuates this welfare harm at scale. Switzerland's legal prohibition of single guinea pig keeping represents the most progressive response to this evidence, and other countries should follow.