Potion Dragons are a strange, artificial race made by a mad alchemist some age ago. Grey, tall, with short horns and a long stripe of fur down their spine, they appear somewhat normal... Until you look down.

Potion Dragons were made to guard this alchemist's lab, while providing support for his other servants. Thus, they produce various types of potion naturally in their stomach, and store it in several places. The most notable a membrane layer around their stomachs and organs, which shapes and acts a lot like fat cells... Aside from the potion staying liquid. They'll naturally swell with it over any given space of time, making the whole of the race appear quite chubby unless drained often. Also notable in possible storage spaces are both the breasts and the testicles, as applicable, dispensed from appropriate spaces.

Potion Dragons can expel excess brew in two ways other than mentioned above; as a liquid from their teeth and tail, or as a superheated and notably team healing steam breath.

Nowadays they're in demand in adventuring parties as support roles, often fed until they're the right size for the adventure- leading to some being fed to sloshing immobility before prolonged dungeons.

Inspired by  smallergod 's I need a break series. Look it up.

Edit: you can also see the potion in them if they've stored up enough. They'll discolor first, then you'll be able to clearly see it as fluid soon after.