What Is the Vaccination Schedule for Older Puppies?

Take heed: Unvaccinated older puppies have needs that are different from their younger counterparts.


Dear Dr. Barchas,

I have two dogs that I adopted on my own from people who did not give them the proper shots, etc., while they were being raised. I have found vaccination schedules for young puppies, but not for older puppies. My Lab mixes are about 6 months old. What shots should they have at this age?


Holland, MI

Vaccines are divided into two groups. Core vaccines are critically important, while so-called noncore vaccines are optional immunizations that may be appropriate for some dogs depending on age, lifestyle, and location.

The three core vaccines for dogs are rabies (which is required by law in most developed countries), distemper, and parvovirus. Distemper and parvo are usually combined into a single injection called the DHPP, which also covers hepatitis and parainfluenza.

Noncore vaccines include leptospirosis, Bordetella (which offers some protection, in theory at least, against kennel cough), Lyme, rattlesnake, and a host of others. Over the years, many vaccines du jour — such as the now-withdrawn dental disease vaccine — have fallen in this category.

Although vaccine schedules are still debated among veterinarians, a consensus has developed among most of the well-respected organizations that provide guidance. Previously unvaccinated dogs older than 4 months should receive a single rabies vaccination, followed by a booster in one year. Subsequent rabies boosters should be administered every one to three years as required by law. Be aware that rabies vaccine requirements can be somewhat fluid — legislatures are notoriously fickle and regulations can change, so check with your vet to make sure your pets comply.

The distemper/parvo combination vaccine is not regulated by law. Most experts recommend that unvaccinated older puppies (or adult dogs) receive two DHPPs, separated by two to four weeks. They should get boosters after one year and every three years thereafter at most. No reputable organization with which I am familiar recommends perpetual vaccination; previously vaccinated mature dogs can go more than three years between DHPPs.

Leenette, your dogs may or may not be good candidates for some of these vaccines. Have a comprehensive discussion with your vet about your dogs’ lifestyles, as well as the risks and benefits of optional vaccines, before they are administered. For your information, my pal Buster has not received any noncore vaccines for many years.

There are two other things to discuss with your vet: intestinal worms and heartworm. Dogs from sketchy backgrounds almost invariably will be infested with worms. Some of these worms can pose a significant health risk to humans, but they can be eliminated with readily available medications. Heartworm is a blood parasite of dogs spread by mosquitoes. It can cause heart failure, and treatment options currently are limited by drug supply shortages. Heartworm is easy to prevent with monthly preventative medication, and many heartworm preventatives also remove intestinal worms.

Got a question for Dr. Barchas? Ask our vet in the comments below and you might be featured in an upcoming column. (Note that if you have an emergency situation, please see your own vet immediately!)

15 thoughts on “What Is the Vaccination Schedule for Older Puppies?”

    1. I have a 5 month old puppy who was just given her first 5 in 1 shot how long do I wait and what are the next shots needed

  1. I missed my puppy’s first shot and vet gave second shot.. She is 12weeks old m really worried about her health …she is active otherwise ..i just want to kw that is it life threatening for her??? Plz reply

  2. Some of that info is listed above, i.e., choose a vaccination that covers distemper & parvovirus protection, and re-vaccinate in 2 to 4 weeks. After that, if possible, wait another 2-4 weeks before getting a rabies vaccination for the dog.
    In nearly every municipality, a professionally-administered rabies vaccination is required to obtain a dog license.
    Beyond that, other initial vaccinations are at your discretion, as they are not as effective and risk further health complications for your dog. However, especially in higher-risk situations (boarding, showing, or other reasons your dog is in close proximity to other dogs, or if your dog frequents a “wild” area where it may contact ticks or wild animals (especially dogs, coyotes, foxes, etc) or be near where they have been), non-core vaccinations, as well as deworming & flea treatments, will be recommended by any informed individual.

  3. I have a 20week old yorkie. I was told from the person he had vaccines but Im unable to give me proof of vaccines given and dates. My feeling is that he has never had any, what kind of schedule should I follow for his initial vaccines

  4. I got a 5 month old puppy from a friend who found her and we have no idea what background she is from, but we can’t afford a full vet visit for her right now. The Tractor Supply in my area does shot clinics every Sunday, or you can buy the shots for $12 or so each. Even though she is older, can we still do things like the Rabies and parvo vaccines that way and have them be just as effective?

  5. I just got a 8 month puppy. The owner said that the puppy was given the 9-way vaccine at 6 months and the rabies vaccine at 7 months. He has not received any other shots. Do I need to give him anymore vaccines?

    1. Hi Audrey!
      Thanks for reaching out and congrats on your new pup! Please consult your vet with these questions.

  6. Hi, how far apart the 1st rabies shot and the 1st DHPP vaccin need to be? my puppy is 5 months old now and never been vaccinated. (We just rescued her)

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