I see JRT. Not seeing much sighthound. Some BYB's have what are techincally Jack Russells and Parson Russells interbreeding. The puppies, obviously, aren't going to breed true to either breed.
My latest resuce effort was a BYB selling "purebred Jack Russells". We took a mother and two pups. The mother was a broken coat, solid white Jack Russell. One of the puppies looked like her at first, but since has grown to probably twice the size of a large JRT, and shows some suspiciously lab-like features. But, by gosh, she's got those papers! The other puppy looks like, well, not sure ... a very small JRT, but sometimes I see some toy fox terrier in her. This charming lady also had a couple of Parson Russells running around, and several dogs which could only kindly be called "terrier mixes". I'm am quite sure she had no earthly idea which male fathered any of her litters.
"We give dogs the time we can spare, the space we can spare and the love we can spare. And in return, dogs give us their all. It's the best deal man has ever made" - M. Facklam
"We are raised to honor all the wrong explorers and discoverers - thieves planting flags, murderers carrying crosses. Let us at last praise the colonizers of dreams."- P.S. Beagle
"All that is gold does not glitter, Not all those who wander are lost; The old that is strong does not wither, Deep roots are not reached by the frost. From the ashes a fire shall be woken, A light from the shadows shall spring; Renewed shall be blade that was broken, The crownless again shall be king." - J.R.R. Tolkien