Do healthy dogs and cats carry rabies virus?

Really healthy cats and dogs have no rabies virus, otherwise how can they be called healthy? The reason why cats and dogs need rabies vaccine is to prevent rabies. What you get is not a vaccine, but an antibody. The difference between vaccine and antibody lies in: vaccine causes specific immunity in vivo and produces antibody in vivo; Antibodies can directly act on viruses and kill them. Because the immune response takes a certain time, when you are scratched or bitten by a cat or dog, you must inject antibodies immediately to prevent infection, because you can't quickly determine whether the cat or dog carries the virus!