Odor of the Day is a 1948 Warner Bros. Looney Tunes cartoon directed by Arthur Davis.
The dog hurriedly phones a Dr. Gesundheit, and Pepé promptly appears in disguise as the doctor.
He tries putting a mustard plaster on the dog's nose and ripping it off, which doesn't work.
Unable to stand the smell of perfume, Pepé runs off outside, jumps into the icy water and returns to thaw himself out in the fireplace, at which point he catches a cold himself.
The pair finally agree to live with the colds and each other since neither can get rid of the other, and as they sneeze, they both say "Gesundheit!"