height can be a problem for rabbits only
i,e bolting rabbits ,,,,,smaller will rain supreme ,,,,,BUT lol depends on dog,,,,( with that in mind,,,,i,e cant keep down a tall dog
i tell u what ,,,,if a ploughed feild is in the picture ,,,,,those taller dogs are un matched at catching the quarry were the smaller dog will fail,,,,,,i,e longer leg helps,,,,,,
but if i was to put up my white dog ,,,,against my taller black dog ,,,on plough or similar rougher ground ,,,,,my 25inch would win ,,,,in speed and longer stride across plough ground ,,,,,,,21inch or 25inch +,,,,,,,they are go