Guelder Rose there is plenty vets do not tell us, it's best to do your research but be aware that you can find internet searches a positive and negative thing.
I believe there is a facebook page for things the vets never tell you, I always find talking to fellow Cocker owners a great help.
As with Wormcount Titre testing is just a snap shot in time, it unfortunately dose not test for all ( sorry can't remember which one it doesn't cover ) but it's another thing that I do instead of just routinely immunise Bea.
My vet is a ex pharmacist who totally agrees in giving a yearly Booster, when I spoke to him about my concerns he agreed that for Bea it is the best for her.
Sharon.