its all the rage at the mo cross breeding dogs, god knows why
take the lab x poodle started by disabled charities for there nature,
you get it just as well nature in pedigree dogs,
ok they done it for a reason,
but you look on sites and see so meny dogs being crossed with something other
i have had both crossed and pedigree's.
never had any trouble with any
although ped's can have problems and need the checks before breeding.

although i dont think you should breed crosses as so meny in rescue
but if by accident ok cant be helped