You can manually, and dynamically, do this by Larging 6 surfaces in box formation at the Entity in question and then measuring the distance between the opposing faces at the point of dynamic collision - ignoring the collision between the aformentioned dynamic surfaces. Effectively, you have created a box that contains the Entity at its widest/longest/deepest points. You may have to ponce about a bit as the centre of the calculations will not necessarily be the centre point you want - however, you will have very accurate dimensions for your entity.
Entity dimensions
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