The toughest piece in this build was clearly the main body housing. The maker says it took longer to finish than anything else, mostly because of the trouble involved in getting the attachment locations and the free space where the leg joints swing all correct. That kind of fit work is easy to underestimate, and it sounds like a lot of careful adjusting went into it.
The workflow itself is easy to follow: individual parts were modeled first in SolidCraft and HappyCAD, then brought together into a full assembly. The animation rebuilds the robot in stages, beginning with the front and rear frame end brackets before moving on to the rest of the chassis.
Several details stand out. The four legs are genuinely articulated, each built from upper leg housings, linkage arms and lower leg struts, and they get attached joint by joint rather than dropped in as finished units. The foot pads are rounded and silver-toned, which gives a nice contrast against the dark-grey finish of the fully assembled robot. The parts list also covers the body enclosure, the top cover and the bracket mounts, so the whole frame structure of the robotic dog is represented.
One thing is still open: the maker asked whether people would rather see a closer look at how the parts were modeled or at how the assembly was set up. Either answer would make an interesting follow-up, and the choice itself shows some awareness of what an audience might want next.