Ya double ref. Its an open species called MJCs or multi jawed canines...not very creative is it

Things to know:
They are short furred and sleek in shape
Mouths that are usually present are the double jaw(most common of all),neck, and tail
Other mouths are the back(rarest), and chest/stomach area
Main jaw open far as shown, it is possible for it to open farther
All mouths have teeth and tongues
Large tall ears accompany pure breed MJCs, shorter for mix breeds
If they have a human form they will have multiple rows of teeth to number of mouths for example Jaws the MJC shown the most would have three rows of teeth
Also all MJCs eyes are two tone as well as their tongue