Monster looks great! Some suggestions I can make are add some bounce to the tail similar to the ears since the monster is moving a lot and break up the timing between then front and back legs, so it's easier to see the movement of the legs and know what is driving what.
is it supposed to run or hop like a frog? dog-like creatures don't run quite like that. hind legs go forward while front legs go Backward between them.
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it looks more like it's hopping rather than running.