Just throwing this out there... There is such thing as a "Deer Chihuahua". Ok, yes, it's silly!! It's the name attached to it.
Anyways, they are full blood Chihuahuas, but don't have the "apple" head and tend to be taller. Basically the only difference is they can be taller (still lanky though) and their head shape is different.
Google it, you may have a "Deer Chihuahua"! (NO, this is not some "rare" or "special" Chihuahua breed to anyone confused! It is a different line that is against the breed standard that shouldn't be sold for higher profits nor confused for a different breed!)
Kaida- CT Female 2.5 Gal.
Julep- HMPK Male 2.5 Gal.
Fandango-HM Male 10 Gal.