Capybaras have become popular exotic pets in some countries but their needs as semi-aquatic, highly social animals present significant welfare challenges that most owners cannot meet.
Capybara welfare in captivity is severely compromised by the social isolation typical of pet keeping. These animals evolved in large social groups and the stress of solitary or pair housing causes chronic anxiety. The requirement for a large pool of sufficient depth for full submersion is rarely met in domestic settings - the inability to thermoregulate through aquatic behavior causes heat stress. Their grazing behavior requires large areas of appropriate grass and cannot be replaced by pellet diets. The exotic pet trade sources capybaras from breeding operations where conditions are often poor. The regulatory patchwork means that in permissive jurisdictions many capybaras are purchased by owners who cannot provide their complex needs. Veterinary expertise in capybara medicine is also extremely limited outside specialist facilities.