Cloning animals is legal in the United States, yet the South Koreans try to save the elderly having Alzheimers are Parkisons. They've cloned Tegon who can glow in the dark. The new mutations in Tegon can be swapped with any substituted with genes that trigger fatal human diseases. It's been done with somatic cell nuclear transfer technology :P
There are 268 illnesses that humans and dogs have in common.