This is a real life anatomy study of a dog in motion, showing up unique poses in motion actions.
Because, seriously, when you draw anatomy based on neutral pose and the same dog with body in motion- they are like two different worlds. I was like "oh shit, few parts of muscles have disappeared and got replaced with new ones" which was quite confusing to official anatomy reference sheets.
But that what makes so much fun and not many artists attempt to draw anatomy studies in motion besides drawing in neutral stances and they think that know everything about anatomy.
So, I encourage to study in motion, even though it's quite confusing and you'll be like all "hey, I don't agree with this atlas! All muscles seems to be totally replaced!" but after training, you'll find out.
I did a real life study based by photographing animal and study based on frozen motion on photographs and real life. Photograph is necessary, because you can actually catch in no-motion frozen picture and real life to observe.
And this is done by tablet. By the way, I didn't pay attention on drawing skulls (I left my skull model at my home) but an addition and I did bigger paws on purpose than in real, because I wanted them to be hellhounds than dogs, simply.
I might plan to do a huge chart of unique animal poses as references for artists.
For this one, you can use as a references! Let me know if that was helpful for you which it will encourage me to do massive chart of animal anatomies.