However, some factors that may contribute to its development include obesity, genetic deformities of the chest region, slippery flooring in whelping boxes and excessive heat. (petpremium.com)
Norwich Terrier breeder Magda Chiarella has suggested that the shape and surface of whelping box may be important. (servicedogtraininginstitute.ca)
He spent money on a proper whelping box with puppy rails, one that can be sterilized between use and has high enough sides to keep drafts out and mess and pups safe and contained. (thedogplace.org)