Comparing welfare states across species raises profound methodological and ethical challenges, but developing credible cross-species frameworks is essential for effective priority-setting in animal advocacy.
Cross-species welfare comparison is both scientifically challenging and ethically essential. If resources are limited, understanding which interventions reduce the most suffering per unit invested requires some framework for comparing welfare states across species. Yet the scientific basis for such comparisons is genuinely uncertain - we understand mammalian consciousness mechanisms reasonably well but are much more uncertain about fish, and even more so about invertebrates. Responsible welfare priority-setting acknowledges this uncertainty, applies precautionary principles toward species with plausible sentience, and avoids false precision in welfare calculations while still enabling informed resource allocation.