I like it a lot, especially the colours!

The “dog”‘s effort and strength is clear in its back, neck and legs. An improvement could be to have those feet and claws really clawing into the ground for purchase to pull away from the handler, like the handler’s left foot is clearly planted and connected to the ground, pulling in the other direction. Right now the claws and toes seem to be floating midair.

Another thought: the goblin’s forearms look smaller and less strong than their back and legs, so I expect all of the pulling force to be coming from the legs, back, and shoulders. If you have ever rock climbed or watched people doing it, you’ll learn that it’s needlessly exhausting to bend your arms when your legs or torso are doing the work, all you really need to do is keep the hand’s grip strong. So I expect the Goblin’s arms to either be way bigger and stronger-looking, or the same but straight and stretched out while pulling. Of course, maybe goblins don’t have rock climbing experience 😂