I think that if you browse around some local pet shops and dog shows, you'll be able to see the resembalance in your dogs.
However, I must disagree to those who think vet's misinterpret things. At the clinic where I work at, we use bloodtests, not only visual annalysis, to identify dog breeds.
However, once I brought in a corgi puppy, and without even asking me, wrote down " Dachund / Terrier Cross" . It honestly depends on the clinic itself.