You can't compare the so called Dog Alien to the Lender crap and video game and comic book bastardizations of the xenomorph; the Dog Alien (Runner/Dragon) is eccentrically a regular Drone/Warrior with digitrade legs and no dorsal tubes. It has no gimmicks or superficial canine attributes - no ears, whiskers or snout, nothing dog-like when it comes to the cranium or body shape, nothing extra dog-like about the teeth or lips... the only thing slightly mimicking dogs and cats is the structure and design of its feet, but it is very, very subtle.
The Dog Alien is pretty much a regular Xenomorph that is just a slightly more adapted to run on all fours. It's a Quadruped, and that's about it. It shares surprisingly little resemblance with its host.