can you make a Cerberus Zolnixi that would look so cool

Hi! I know this is already in the suggestion box portion of the forums, but specifically in the suggestion box forums, there is already an official pinned forum for users to suggest new pet species they'd like to see(Link is clickable):
https://www.sylestia.com/forums/?thread=28
So you should likely post your new species suggestions there as intended.

Also, since a Zolnixi is already a species, I think suggesting a Cerberus based mutation trait for a Zolnixi would be an interesting idea instead. Sometimes, for the big four seasonal festivals, there are contests held in the Official Games and Contests forum, for designing pet traits.
You could draw or make a sketch of your idea of a Cerberus mutation trait for the Zolnixi species and submit your design the next time a trait design contest is posted.

Another possible idea would be, when the Festival Themed Design Contests are up for each season(Also in the Official Games and Contest Forum), you could design/color a Zolnixi based off Cerberus in the generator, save your design and suggest it as a themed pet.
This is the Generator(Link is clickable):
https://www.sylestia.com/generator/
Though keep in mind, when suggesting a themed pet for a festival, it does need to fit the season that festival is for(Spring, Summer, Fall, and Winter), so if you do suggest a Cerberus theme, make sure to post it in the themed pet design contest that best suits a Cerberus Zolnixi.

I hope none of this comes off as rude at all, I just wanted to offer a few suggestions and clarify where new pet ideas are supposed to be posted. Also, since you're newer, welcome to Sylestia. I hope you enjoy playing! ^^