I know this was well meaning, but it is not fact. It has not jumped back and can't. what can happen is an infected person holding a dog, and then the dog getting tested could show a possibly weak positive. just like touching an inanimate object, an elevator a door knob a counter top, etc., the virus can survive for a while and if a person touches that object it is possible to contract the virus. that is quite different than we are all going to die because pets can catch the virus and kill us. this is the 3rd. time today I have heard a person state that a dog got the virus. no. it did not. it can't. it has not a thing to do with a mutation and jumping species. it is because the infected person touched the dog and left the virus on the dog.