Columbia subject headings:
Aging--Humor.
American wit and humor.
Conduct of life--Humor.
Humor.
Pets--Humor.
Harvard subject headings:
Aging--Humor
American wit and humor.
Conduct of life--Humor.
Human-animal relationships--Humor.
Humor.
Pets--Humor.
Princeton subject headings:
Aging--Humor.
American wit and humor.
Conduct of life--Humor.
Humor.
Pets--Humor.