All studies showed the addition of the B strain improved the antibody response to that strain and didn't weaken the body's immune response to other flu strains in the vaccine. (sciencedaily.com)
Learn about the various types of flu strains that you can catch this year. (scientificamerican.com)
Unless your dog is real young, old, or ill, I think it is just like human flu strains and it will pass. (thatmutt.com)