Titering is a blood test that checks the blood's response to primarily parvo and distemper. MANY of the standard labs (like Antech) essentially give you sort of a "pass/fail" type of answer (which will stand in most places as 'proof of vaccination' when you tell them you 'titer';). Usually it's about $45 or $50.
You can, if you prefer, have it sent to a lab like Cornell (SUNY Vet School -- and a cutting edge vet school no less). The results you get back from there are far more specific -- so you know better if your dog's immunity is 'satisfactory' but WAY high (rah!!) or in the middle somewhere or low and so you'll need to watch carefully next year -- you may need to vax.
I prefer the ones from Cornell (gee, bet you could tell just the way I said that, huh?) -- but it's about $90 for the test.
However, my answer isn't going to end there -- because a lot of this is worthy of discussion.
And since Gina mentions immunosuppression I will too. I have a dog who is **extremely** immunocompromised -- my English Cocker Billy has had IMHA which is an 'autoimmune' disease and I literally have been told by holistic, regular and even vets up at the U of Florida -- that he can NEVER EVER be vax'd again. It literally would likely kill him because it would likely trigger the IMHA to return.
However, we do pet therapy, so I titer simply so we can a) keep track of where his immunity is, and b) so we can have proof that his immunity is sufficient to take him to various institutions.
Essentially, what all the flap is about -- repeated vaccines (particularly annual or even semi-annual ones) are pretty new ... but they are a drain on the immune system. There is a lot of "correllation" (and a correllation isn't necessarily 'fact' but it is a trend or LOOKS like it has merit) between the increased vaccinations and the increase in "auto-immune" diseases and various things that simply fall under the category of "vaccinosis" -- or illnesses/diseases caused for some reason by the vaccine itself.
When killed vaccines became more popular (about 15+ years ago) it was also well known that they weren't going to provide as *lasting* an immunity as the modified live vaccines did. So, as a self-protective measure vet schools taught for many years that vets should advocate an annual 'wellness regieme" including annual vaccines to be sure the vaccines stayed boostered. At that time no studies had been done as to the effectiveness of the new vaccines.
Those studies are being done ... and you may want to investigate them further (Janet makes reference above). Vaccines are one of those things that most people have a DEFINITE opinion on. Kinda like everyone has a definite preference between mayo and Miracle Whip?? Ok -- take that to about the third power -- vaccines can be a huge sticking point for people and everyone in this thread is trying to be really careful to stay cordial.
And to a huge degree what your position is may reflect your own experiences. I tend to have a more holistic leaning, altho I use an 'integrated' veterinary approach (I use both a holistic and regular vets from different practices but who work together) but my outlook is colored a great deal by my past experiences, both with Billy and other dogs and my own personal study.
But I can't encourage you strongly enough to TALK TO YOUR VET And if you feel, for whatever reason, like you just can't get thru, or they don't listen to or respect you, or ... whatever stops you .. then find someone else. But be careful.
However, a relationship with a vet is BUILT. If a thing worries you or you don't understand it ... ask. And .. if you don't get a sufficient answer or one you understand ... ask again. Be polite. And don't shove those words "I read somewhere on the Internet that ..." down a vet's throat and expect them to turn cartwheels for you.
If you read something that puzzles or worries you -- research it. And then go to your vet and ASK where else you can look, or what does this mean ...
But some vets will simply dismiss certain things -- and then your job is to figure out whether they don't have time, maybe it's because they just don't want to be questioned, or is it really not important ... or ... is the vet wrong. or ... what. I've got certain drop dead things that will make me leave a vet. But I've developed those over the years from ... you guessed it .. EXPERIENCE. But if you can't get to first base asking questions -- my way is to be honest. Maybe I do it in a LETTER even (I really don't like confrontation any better than the next person) -- but I'll say "Dr. ____, I really am kinda feeling a bit like I'm not being heard ... but I don't want to jump to conclusions -- and I truly DO want to understand. Why do you recommend that particular thing?"
If you have looked at a lot of websites, and checked out the opinion of others ... and then you say to the vet "I've done a lot of reading -- both magazines, the internet, and I've talked at length with many folks -- would you explain to me your position on __________" (titering, vaccines, which heartworm prevention to use, etc.)
I've found, tho, that the vet you can talk to, learn from, and trust ... that relationship is precious. So if I ask a question I make sure I'm respectful and I weigh the answer carefully.
Talk to other people -- and research things. Asking a question like this is good -- and altho you may get a ton of different answers, you will also begin to find where you can go for more answers. And always remember that if you go to a website that is 'sponsored' by a company, you are going to get a picture pretty slanted towards supporting that opinion. So asking who sponsors what or who gets support from what .. those are good questions to ask as well.
Good luck.