The effect of mechanical sterilization on social and territorial behavior among captive coyotes (Canis latrans) was studied from November 1989-November 1990. Experimental treatments included control, tubal-ligation, and vasectomy and were replicated 4, 2, and 3 times, respectively. Focal animal sampling was used to estimate the frequencies of 6 social and 6 territorial behavior over 3 seasons: nonbreeding, mating/pregnancy, and pup-rearing. Frequencies of social and territorial behavior were analyzed by summed social behavior, summed territorial behavior, and by individual social and territorial behavior. I found no evidence that sterilization treatments affected social or territorial behavior exhibited by captive coyotes, but low statistical power precluded a definitive determination.