A decrease in motor activity is an expected concomitant of normal aging and has been reported in humans and nonhuman mammals. We have previously failed to find age differences in open-field locomotor activity in beagle dogs. We now report an age-associated decline when activity measures are taken in the home cage. Locomotor activity of young and aged dogs was examined in both open-field and home-cage environments. Dogs were given six activity tests (two open field, two morning and two afternoon home-cage tests) every second day. Aged dogs were less active than young dogs in the home cage but not in the open field. Activity also varied as a function of sex and housing condition. Behavioral activity is a complex manifestation of many underlying factors.
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