IMPA in dogs (immune-mediated polyarthritis) takes place if the immune system assaults a dog’s joints, bringing about painful swollen joints and lameness that appears to transfer from leg to leg. natural - in accordance with nature; associated with or regarding nature; "an extremely natural improvement"; "our natural ecosystem"; "natural science"; https://eduardovlxwq.alltdesign.com/not-known-facts-about-natural-calming-solutions-for-dogs-54919979