"Goldmeier (1986) aimed to discover whether animals could fill the gap created by absent humans. One hundred and four-four elderly participants, living alone, living with others, living alone with pets or living with others and pets, were assessed. The groups were demographically similar and results showed that pets did not make a difference to morale amongst those who lived with others but that they improved the morale of those living alone."
January 1, 1970
https://en.wikiquote.org/wiki/Pet