The phrase "human flu" refers to a contagious illness that affects people. It is a common term used to talk about the flu or influenza virus that makes humans sick. Full definition
By the eighth day, a time when the three control monkeys infected with a common human flu virus were recovering, the experimental animals were so sick that they had to be euthanized. (sciencemag.org)
Unless your dog is real young, old, or ill, I think it is just like human flu strains and it will pass. (thatmutt.com)
They do not provide 100 % protection (like human flu vaccines). (dog-health-guide.org)