IMPA in dogs (immune-mediated polyarthritis) happens in the event the immune system assaults a dog’s joints, resulting in painful swollen joints and lameness that seems to move from leg to leg. natural - in accordance with nature; relating to or regarding nature; "a really natural improvement"; "our natural natural environment"; https://auto-accident-legal-help78956.digitollblog.com/35598460/not-known-facts-about-natural-calming-solutions-for-dogs