Great to see you on the community.
Cool start with the model -- looks like the general forms are fleshed out pretty well.
Some notes as I see it:
To me it feels like the upper front legs are a little wide. Have a look at this image from Animal Anatomy for Artists. (Great resource)
You'll see as well that it looks like you're missing a muscle. Or perhaps that it's the infraspinatus and the deltoid have been merged into one. You should also be able to see a bit of the scapula in the same area where the trapezius attaches:
As for the back legs, it looks like maybe the tensor fasciae latae and the sartorius are merged into one muscle. In which case the sartorius part I think is running down the wrong side of the leg, it should run to the inner side of the tibia.
As for the topology of the muscles/bones one thing you'll need to be aware of is that Ziva needs to have meshes that have triangles (all Maya meshes are triangles internally) with angles that are not super acute. Also the meshes need to be non-manifold. Sometimes scanned models can have weird topology.
There is a built in remesher with Ziva (The isomesher in the Ziva tools menu)
Failing that Mudbox and Zbrush both have pretty good remeshing tools, I prefer Mudbox personally.