I saw several instances of chew through in Guatemala. The family dog at my in-laws house habitually chewed through my father-in-law' hammocks. My father-in-law was a truck driver.
Truckers there will often hang a hammock along the edge of their trailer when waiting for a load or waiting in line. It is HOT along the south coast where we lived. So the hammocks collected more than their fair share of sweat.
It generally started off with licking, nothing like climbing a soggy hammock. (yummy dog spit)
Stories also are told in Northern MN about axe handles being chewed on by porcupines. Supposedly for the salt from sweat.