Larry Niven's RAINBOW MARS - a collection of Svetz stories (1999.) This contains 5/7 of THE FLIGHT OF THE HORSE (a paperback collection from 1973.)

Rainbow Mars - {an original novel: over 200 pages}
The Flight of the Horse - (original title: "Get a Horse!")
Leviathan!
Bird in the Hand
There's a Wolf in My Time Machine
Death in a Cage

Original appearances from 1969 to 1973 - most from Magazine of F&SF, plus 1 from Playboy; the last story was original to FLIGHT OF THE HORSE.