In the early days Dwarfs were allowed a pony or two, but never in very large numbers!
Painter:
Pennyfew Painting (Rob Wheeler)
Mounted Dwarfs
FAC15 Mounted Dwarf with Two-Handed Hammer
FAC29 Mounted Dwarf Champion
FAC34 Mounted Gnome Warrior Thief
FTD15 Mounted Dwarf
Clearly based on the same pony as used by the Mounted Dwarfs and Gnome
C25 Pack Pony