Yes definitely a tegu. Yellow journalism at its finest I might add. In the defense of their paper, there is a research scientist(Dr. Frye, aka the Venom Doc), that claims all large lizards are venomous, siimply because they have cavities that may have at one time, supported venom glands, and sport toxic saliva. I disagree with him, as every species on the planet which produces saliva has some toxicity to it so therefore your dog is venomous, by the basis of his research. This is the same guy that claims that some American colubrids, are as venomous as cobras, if not more so.