I think you need to assess your risk. A friend has one of my boys, and a Corgi. Both are around 5-6 years of age and very healthy. They accompany their owner everywhere on the farm with hundreds of acres, including cattle, horses and mini-donkeys. They rarely leave the farm, don't go to dog parks, dog shows, classes, neighborhood walks, boarding, festivals, etc. She asked, and I said that her boys are both very low risk right now. Our vet agrees.
However, if you participate in any of these activities-dog parks, dog shows, dog classes, neighborhood walks, boarding, festivals, etc.-I would recommend it.
Here is just one real life story of how "regular" dogs can get the flu. Dog show competitor comes home, dogs seem fine, play in backyard, fence play with neighboring pet dogs. Several days later show dogs are very sick and within hours, so are the neighboring pet dogs. Canine flu
. Dogs exposed to the pet dogs on neighborhood walks, etc. are now at risk.
Also, I have heard from more than one person that when they asked their vet about getting the flu shot, they were told their dog had already been given the flu shot. When pressed, because the owner could not remember asking for the flu shot, it turned out the vet staff was talking about the parainfluenza vaccine, which is a part of the regular shot and does NOT cover this flu.
If you get, get either the bivalent, which covers both N8 and N2, or at least N2. It requires 2 shots, 2-4 weeks apart and then a booster in one year.