A 6 foot snake at 90 pounds will look like a giant football. Even the heavier boids at 6 feet are only around 20 pounds. At 10 feet, around 40 pounds.
This is an example of media hype and fear mongering. With that being said, a 6 foot snake at 20 pounds is an incredibly strong animal and is fully capable of defending itself against many predators... including dogs and people.
They should be respected as a wild animal and not messed with if you run across a large boid in the wild. In most places in the US, you run across one, and it’s almost guaranteed to be a recent escaped pet. That means it’ll be used to people and is quite a bit safer to come in contact with vs. a wild bred snake.
Florida is probably the only exception to this rule being that it’s the only place in CONUS that can support a wild population of these snakes.
Actually the weights were referring to the dog.
I can see the length of unknown snake being mistaken but you should know your own dog’s weight.