Will Falconer, DVM Moderator
The Canine Immune Complete, linked in the show notes, is your best bet. And please don't think you are up against a time table set by your vet. Cancel and reschedule the vacc appointment if you need to. After all, it's not like immunity from the past vaccines is slowly draining away, like an emptying gas tank.
Here's the link once more for our top of the line immune support: https://vitalpethealth.com/product/canine-immune-complete/ Start a 3-5 days before vacc and continue daily use afterwards.