Not that you could likely aford the Karma or Nuyen, but Prototype Transhuman with Orthoskin and Bone Density upgrades will get you more soak. But in all cases you will be better off in your Metahuman form with armor and a weapon.
The Animal form for Shifters is 100% cosmetic, and is mechanically useless for almost all purposes, at least for the bigger ones. Fox, Dog, Falcon forms have some uses. Falcon can fly, that has to come in handy occasionally. Dog as a instant disguise, Foxes can get into small spaces. As long as there is no Astral Security or you've got a way to hide your Aura, the smaller forms can do some light scouting work.
Now, if you go with lots of Reaction, Intuition, and max out combat sense you can claw your way to a moderate defense test in your Animal shape. The Felines are better suited, but as you noted they cost a silly amount. But an Ursine with 12+ dice on defense tests would have some staying power.
Mostly it's a cute party trick, sorry.