Is it possible your dog transmitted a zoonotic disease to your husband? Zoonotic diseases are those transmitable to humans from animals ie ringworm, rabies, chlamydia, hookworms, salmonella, septicemia, I could go on and on. Don't let me freak you out.

It is unlikely your husband caught you dog's illness; it is unlikely your dog caught your husband's illness. Just chill. Everything will be okay.