Hoofs and Goofs (1957)

Joe dreams that the stooges sister Birdie has died and been reincarnated as a horse The stooges take Birdie home but must conceal her from the snoopy landlord They succeed but more complications ensue when Birdie gives birth to a colt Joe wakes up to suffer some abuse from the real Birdie Moe in drag when he tells her he dreamed she was a horse