With SwiftPaws I don’t think that’s anymore or less injury possibility than other equipment in fact it may be less as they’ve incorporated some safety measures to power down the machine if too much resistance is applied like a dog’s paw getting tangled. And because Swiftpaws is designed for more of a homeowner type machine it’s more finicky so it probably will power down quicker than professional equipment trying to avoid dog injury siding on the safety side. I actually prefer Swiftpaws pulleys over other professional brands as they have a wider mouth and clam shell design to allow for a lot of different lures (fur and rubber caps like Injoy brand pulley uses etc… and with their clamshell design like the Lucky Dog Brand pulleys (but wider mouth) they keep the line more stable and therefore less likely to jump off the pulley.