Supplement use is common in Dog Aging Project participants, especially among dogs with orthopedic conditions, and varies by life stage.

Examining owner demographic variables ( Table 2 ) , there was a slight trend for older owners to be more likely to give supplements, with 1,011 of 1,894 (53%) owners older than 75 years of age giving supplements as compared to 359 of 750 (48%) owners 18 to 24 years old giving supplements.

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