Short spine syndrome is a very rare congenital defect. Part of awareness Tilly raises is to never breed dogs with short spine syndrome.
Here is more Tilly:

Short spine syndrome is a very rare congenital defect. Part of awareness Tilly raises is to never breed dogs with short spine syndrome.
Here is more Tilly:

Also dwarf cats, which includes the type people have taken to calling “munchkin cats.” There’s nothing wrong with being a dwarf person, but there are strong concerns about the quality of life for dwarf cats just because of their short legs.