How to keep them safe but avoid over-vaccinating.
What Are Titer Tests For Dogs?
"Titer tests are among the tools that dog owners and veterinarians can use to help minimize the risks of both infectious diseases and unnecessary vaccinations. A titer test is an antibody blood test that can tell you if a previous vaccine is still protecting your dog's immune system. If it’s still working, by producing antibodies, you don’t have to revaccinate yet."
-Bark
"Titer tests are among the tools that dog owners and veterinarians can use to help minimize the risks of both infectious diseases and unnecessary vaccinations. A titer test is an antibody blood test that can tell you if a previous vaccine is still protecting your dog's immune system. If it’s still working, by producing antibodies, you don’t have to revaccinate yet."
-Bark