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Usually because most genetic variations/mutation will mean non survival in the wild. If you don't survive to reproductive age you cannot pass on the mutations. FTR there are 'dwarf rabbits' but I am unsure if they are selectively bred.
There are a number of 'dwarf' and 'pygmy' varieties of animal but these are not true dwarfs. Generally these denote breeds or species that are smaller than those we generally think about for that species. My wife breeds African Pigmy Hedgehogs (incredibly cute - I'll post a picture if you like) but these are not dwarfs. They are just a small species and the entire population is a similar size.
So what about domesticated animals that have been removed from the Darwinian 'survival of the fittest' selection process. Do we ever get dwarf cows, for instance. Would these be destroyed by farmers at birth or do they never excist?