My two boys, Cooper Bear and Axel are supposedly purebred Jacks. But my fist Jack Russell looked nothing like my two boys, and they themselves dont look like each other. It would really help me if someone could give me some advice as to what they think my boys look like they are mixed with. Or if they really are purebred and I'm just dumb haha.
I'm in the UK where Jack Russell (as opposed to the Parson Russell) is not a breed recognised by the UK Kennel Club. But they are a distinct dog with their own breed club and breed standard. Your two look perfectly normal to me. They have good markings and are both very handsome.
It would be good to see some pics of them standing in good light to see how their legs are and what their chest confirmation is but they look like Jacks to me.
I'm with the others. They look purebred to me. I have done a lot of Russel research since one of my babies is a Jack mix, and those look like what Lara's Mom mentioned, a shorty jack.