Adrenal disease is nearly universal in ferrets over age 3 in North America, causing hormonal disruption and significant suffering — a welfare problem with roots in early spay-neuter practices.
Ferrets with adrenal disease experience progressive deterioration — hair loss exposes them to temperature vulnerability, muscle wasting reduces mobility, and hormonal imbalances affect multiple organ systems. The disease causes chronic discomfort over months to years before death or euthanasia. The association between juvenile spay-neuter and adrenal disease prevalence suggests a preventable welfare crisis rooted in breeding industry practices. Delayed neutering or hormone implants can reduce disease risk, but most North American ferrets are already altered before purchase.