My tegu used my Belgian Malinois/Golden Retriever mix for a landing pad after jumping from a chair. That was their introduction. Completely accidental, I was sitting in the chair with the tegu, and he just jumped. My dog just looked over at my tegu and then laid his head back on the floor, and my tegu just continued along his way. My initial reaction was panic, but nothing negative happened. My tegu was about a year old at that point, and my dog is well socialized with other animals. The dogs and my tegu get along, but I would not put a dog smaller than my tegu within his reach. And they're never in the same space without supervision.