
Based mainly on design (haven’t kept up with clues very well), I think this pup is Nadine’s.
1. Her pups, more often than not, have a flat coloring and with sharp-edged details (no additional shading or blended colors). Most details and line edits usually appear on her grown outcomes only.
2. It has her signature swirl that appears on every dog except in 2019, though it only appeared on a growing pup once before
3. It has a heart marking and tail stripes similar those on her 2017 outcome
4. The ears are darker than the body, like on 3 of her other staff dogs
Previous outcomes for reference:





Edit:

This draft designed by Nadine has a similar swirl from shoulder to back in the growing and grown stages

More swirls in her March 2015 litter
The only things preventing this pup from screaming “I’M NADINE’S” is the lack of coloring around the eye and the lack of pointed ears <3