I know theres the genderless berry, but there used to be a sex berry to change gender, thats no longer for sale/doesnt exist. thanks for any help.

It's now called Gender Berry, it is a pretty recent change. :)

, thank you, Ive just been sent a Gender Berry by the very kind if only I'd searched gender. Sorted, close please :0)

Wow, that is really possible?

Yep it sure is! You can swap a pets gender with the or make them genderless with the . If you create/build a brand-new steamwork pet they will have a gear icon as their gender too.