What is DIM weight pricing, and how does it affect pet product contracts?

“Dimensional weight pricing bills the greater of a package's actual weight or its size-based weight, using a standard UPS and FedEx divisor of 139 for domestic shipments. Bulky pet items such as beds, crates, and large food bags frequently bill above scale weight, and negotiating a higher divisor lowers the calculated DIM weight across the entire catalog.”