Is there such things as mongrels?

Answer 1

A mongrel just means the dog is a mixed breed, and breeds of it's parents are unknown. Knowing a dog's lineage is only necessary if you plan on showing the dog (and even still, these days there are dog shows for mixed breed dogs).

Monggrels, or mixed breed dogs are every bit as lovable, loyal and trainable as their pure bred cousins. Mixed breed dogs have an important plus, they're generally healthier than a purebred dog.