"I do not recommend this product for ferrets for a few reasons. The first thing is that the buckles are on the bottom of the harness, which can lead to them dragging on the ground, especially with a smaller ferret. Secondly, the straps do not have any way of fastening the loose ends when they are adjusted, so that they flop all around and can also drag. Thirdly, the Velcro can only be adjusted to a certain point, and it is easy for a squirmy ferret to loosen. Because the more secure buckle goes over the Velcro, it is hard to tighten this harness enough to make it stay on. Also, because of the Velcro/buckle combo, this is hard to put on even a patient ferret, and certainly not a ferret who is dancing for joy because it is time for walkies. Fourthly, even though this harness claims to be adjustable, because of the placement of the buckles and Velcro, it is actually less adjustable and less secure than a regular harness. All in all, I would not recommend buying this for a ferret at all, though it may be suitable for other small mammals."