Many good vets only do those tests on older dogs. The really young ones are not considered to be a very high risk (I don't know why). And I don't what the age is that they consider them more at risk but I believe it is after they are a pup. So, after a year? And then some vets do it to all of the animals. I think they like to make their money every way they can. These are probably the vets pushing yearly vaccine boosters as well. Just a thought.