Thanks for the great comments everyone.
No, they're not my patterns, but I think I will redesign them to have a chest gusset. I think the front legs are a bit dorky so close together!
I added the brown patches to the dog pattern, and in hindsight I would have made the mask more central (I didn't allow for the head gusset!).
But its all a learning experience.
I stuffed the horse and fox with carded wool, but used synthetic fill for the dog, and I think I prefer how that feels. The wool can be a bit lumpy if you stuff them firmly.
Any thoughts on this?