Use the cheat code cas.clockspeed 0.2 to slow down the animal's breathing, making it easier to paint fine details.
Installing pet makeovers is different from standard CC because they are "household" files, not just individual mods:
To make the dog look exactly as it does in the creator's images, you must download both the dog data and the specific custom content (CC) used: The main files for the "Dachsie" makeover.
This guide explains how to install and use the custom (featuring a shy dog named "Dachsie") created by Blue Ancolia for The Sims 4 . Prerequisites