"In regards to the monitor lizards, the Nile Monitor is quite large though not the second largest lizard in the world (I forget the name, but I believe it is a monitor lizard from Borneo). Like many animals, they are aggressive when cornered, but they are far more likely to run away from you given the chance."
Ah, my reptile specialty, monitor lizards, Ive been a long time keeper and was breeding them once.
The second LONGEST by a few rare examples could be the crocodile monitor from New Guinea, the record by official length (not by weight, mass, or overal size) was a water monitor that grew to 10ft 4 inches but was nowhere near the adult weight of a komodo dragon. There are a few species of monitors that grow to lengths of 6ft plus, I have one of those that is currently over 10 years old, and as an individual she is a very gentle, but a big predator of small animals none the less.
For example my 6ft 9 inch female white throated monitor weighs around 40lbs at most, a comparable female komodo would weigh closer to 75lbs.
Komodo monitors are apex predators, nothing on their islands is a big enough threat to them, their only predator is themselves (most young are eaten by adults).
As far as indigo nsakes go, old wives tails about them growing to 10ft, or even close. The longest native species of snake is the eastern diamondback rattler, there are a few rare examples that grew to 7ft, Im sure the record was over 8ft for one example.
The nile monitor is a close relative to my "little girl" but the nile is s long thin water dwelling species that holds Africas record for length (one caught in an elementary school playground along the nile river was 7ft 11 3/4 inches, nowhere near by weight.
Dogs are very dongerous to all but one species of monitor lizard, monitors are fast, they will run long before they stand their ground, but when they do they bite like a pair of vice grips with steak knives for teeth, and have very very sharp claws that are propelled by very strong legs.
My big monitor came in handly when snakes escaped on occasion from a friends collection, only if they were venomous, she found them in a hurry, the trick was to get them before her, she loves to eat them.
I had a finger broken by one 4ft monitor that grabbed a mouse from my hand one time and the mouse wrapped around the finger.
Shoot the snakes with a small rifle or pistol in the head.