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. Also we have some great resources here for animal…
Id love some feedback on topology of my horse and dragon basemeshes especially from riggers Horse: https://skfb.ly/pwHZO Dragon: https://skfb.ly/pwHYE It's all quad, no hexapoles, meant for subdivision high poly sculpting