Beautiful Casper ~ If you have access to your Mom's credit card, you might consider ordering a doggie DNA test from: http://www.whatismydogtype.com/

My sister ordered a similar test for her dog Sascha. Her nickname was Little-Bits-of-Lots-of-Dogs
Sadly Sascha went to the bridge before the results came back. We are pretty sure she had some husky in her due to her wolf howls and sky blue eyes, but it was never proven.

Results: The DNA mix is broken up into 3 categories. According to the information sheet, the definition for "Primary breed category" is when 50% or more of the DNA is from a single breed.
The "Secondary category" is defined as breeds clearly recognizable in the DNA, but not predominant.
The "In the mix" category is defined as breeds identified as having influence, but in lower quantities than the "secondary" category. And the results are.....drum roll........

Primary Breed: BLANK! Ha! (So, 50% of her is still a mystery)
Secondary Breeds: Shetland Sheepdog and Collie
In the Mix Breeds: Samoyed and Belgian Tervuren