Flew Air France from LIS-CDG in 1994. Lots of French Dog Exhibitors returning from a dog show with their animals. Terrible flight but I can't remember whether it was because of the dogs or their owners!
MOW- VVO on Aeroflot, passenger come on board witha fully grown Great Dane!!.... the seats on the Il 62 can fold up.... so the owner tipped the seat bottoms up, the dog lay down with its head at one end of the row and feet under the other end... stayed there for the whole flight