Odor Control ------------ The objectionable odor of pet ferrets is primarily the result of the influence of sex hormones on normal skin secretions. Consequently, castrating male and spaying female ferrets is usually sufficient to control this problem. It is usually done at 6-8 months of age. Castrating male ferrets also helps reduce any aggressive tendencies. A very pungent and equally objectionable secretion occasionally is produced by the ferret's scent (anal) glands. Some owners also have their pet ferrets descented.