Pluto

[Per Starback]

Well, in Pluto the Racer (1935), as published in MM 235, Horace refers
to Pluto as a "knee-action spaniel" to which Mickey responded that
"he's not a spaniel!  He's a hound dog practic'ly pure-blooded!"

I suppose there are other data as well.
--       "
Per Starback, Uppsala, Sweden.  email: starback at minsk.docs.uu.se
 "I shouldn't allow him in the race!  You see these other dogs all
  have pedigrees!"
 "Oh, but Pluto wouldn't catch it--he had ev'rything when he was a pup!"