From ErfWiki

Proposed Canon

First Appearance: TBFGK 12

A type of Dwagon. Stanley's current favorite mount is a red dwagon that wears armor.

Artemis stated that the gas breath weapon of a green dwagon was able to form a combo with the fire breath weapon of a red dwagon. She also mentioned that while the fire breath weapon deals damage, the green dwagon's gas breath weapon has a chance to croak a unit instantly. LIAB Text 52

Speculation

The red dwagon breath attack is a fire attack.^Erf-b1-p050