http://www.smartgroups.com/message/readmessage.cfm?gid=1423922&messageid=2068 There has been quite a bit of work with melatonin in ferrets, dogs, and in mink.Here are a few articles about it. 1) Diagnostic Laboratory Insight with Regard to Adrenal Disease by Jack Oliver ( U of Tenn), Proc 20th ACVIM 2002, p541-543. 2) Melatonin use in ferret adrenal gland disease by J. Paul-Murphy (U of Wisconsin) Proc N. Am. Vet Conf. Vol 15, 2001 pg 897. 3) Melatonin therapy for canine alopecia. Kirk's CVT 13 by Manon Paradis (U de Montreal) p546-549. She also describes the mink melatonin implant. 4) Diagnosis and Treatment of Adrenal Tumors in Ferrets by James Johnson (Texas A&M) Annual Exotic Pets Conf. 2001 p3-6. 5) Studies on the duration of the breeding season and photorefractoriness in female ferrets pinealectomized or treated with melatonin. by Penelope Thorpe + J. Herbert (U of Cambridge) Journal of Endocrinology 1976, 70, p 255-262. 6) Effect of oral melatonin administration on sex hormone, prolactin, and thyroid hormone concentrations in adult dogs. by Patricia Ashley et al (U of Tenn) JAVMA Vol 215 No 8, 10/15/99, p 1111-1115. 7) Induction of winter fur growth in imnk with melatonin. by J. Rose, J. Anim Sci, 1984 Vol 58 p 57-61. Jerry Murray, DVM [Posted in FML issue 3956]