Info on prescription diets needed please

I cannot seem to find any sites that list the ingrediants for the
prescription diets of Purina, Eukanuba or Waltham. Anybody have any info on
these?? I'm trying to do some research into them just in case they are
needed (I have to take a urine sample from my Kira in on Monday), and for
reasons I won't get into here, I will NOT feed Science Diet foods, so would
like to look at other options so if needed, I can talk to the vet about
them.
Thanks,



--
Bobbie and the canine herd...
Kira and Krysta (at best guess JRT/Pap/??? mix)
Jessica (Australian Shepard mix)
and Abby (GSD/Heeler/??? mix)
....or as I like to refer to them all...MISCELLANIOUS ASSORTED