I would suggest rigging these up for animation, and doing a run cycle. This will expose issues with the topology, and make it easier to see what needs to be fixed. Topology for animation has specific needs, and this is best learned by doing, experimenting, and adjusting.
Replies
https://skfb.ly/pwItV
(Intended to be sculpted into cat's dogs and such)
Also we have some great resources here for animal animation: https://polycount.com/discussion/158862/animation-reference-and-inspiration
Some links are broken, but it’s still very much worth it to dig for the gems!