Tarantulas and other pet spiders have specific husbandry needs, and their welfare is shaped by temperature, humidity, and behavioral opportunity.
Pet tarantula welfare depends primarily on meeting species-specific husbandry requirements that owners frequently research inadequately before purchase. Incorrect temperature or humidity causes immune compromise and premature death. Insufficient substrate depth prevents burrowing behavior in terrestrial species. Inadequate hiding spaces cause chronic exposure stress in shy species. The question of whether tarantulas and other invertebrates experience suffering in ways that are morally relevant is genuinely uncertain. Applying the precautionary principle — providing appropriate environments even under uncertainty — is both ethically defensible and practically wise since well-housed tarantulas are more active, eat reliably, and live longer.