The #1 question we get from the public is "What breeds do you use for service dogs?" If you want the short answer, click here (our FAQ). If you want the long answer, read on. :-)
Finding the right characteristics in a service dog candidate dog is more complicated than one might think. One might assume the answer might "Mixed breeds" or "goldens and Labs," but those answers would be doing individual dogs a disservice, and we estimate that only 1 out 1000 dogs is appropriate for service dog work. For instance, some golden retrievers and Labradors are good at service dog work, but many others are high-energy and are not a good fit for staying calm all day long. We use many tests to find candidates (details below), but also, there are many other variables involved. For instance, the breed characteristics that would work for one family may not be the best for another. It's important to know the typical breed characteristics, of course, but what is just as important is the fact that not all dogs display their breed’s traits. Purebred dogs are certainly purpose-bred, but breed characteristics are remarkably different depending on which particular dog you happen to be looking at. For example, even though we don't use the following breeds, there are some pit bulls that get along with all dogs, and there are some dobermans that are docile and easy for a new owner. This page, however, will give you at least a rough idea about breed standards and why so many breeds don't work well with our work.
Finding the right candidate dog for service dog training is no small task. As mentioned above, we estimate that only one out of a thousand dogs is appropriate. Even with that level of selectiveness, at all service dog organizations, “according to some estimates, only 50% of dogs entering training progress to the level of a service dog.” Many trainers and breeders have designed tests for dogs that focus on puppies, but unfortunately, empirical studies show that these tests, while easy to give, often don’t predict adult temperament. Specifically, a study of the Campbell test to determine a puppy’s behavior concluded that “the test has no predictive value regarding future social tendencies.” For adult dogs, the most commonly used predictor of temperament is the Weiss & Greenberg test, but it, too, has been empirically tested to be a “poor predictor of training success.” Thus, we use a different testing method. First, if the dog is the right age and weight, we start with a "pretest" we devised to determine if a dog might be a good candidate for adoption. Rescues are always surprised at how low-energy and low prey-drive we like candidates to be, for instance--it makes them harder for us to train but ultimately easier for the handler to live with. We also are looking for a dog to be gentle and easygoing yet but brave (a rare combination of traits). Few dogs pass this pretest, but if they do, we then use a more formal test called the Dog Personality Questionnaire (DPQ), which is "demonstrably reliable and valid" at finding a good candidate for training. This Dog Personality Questionnaire is more difficult to administer than either the Campbell or the Weiss & Greenberg test, but since it's more accurate, we feel that the extra effort is worth it.
Here are some of the questions we are often asked:
Does the sex of the dog matter?
In terms of service dog work, it really doesn’t matter whether a dog is male or female. According to one study, neither sex is better than the other at being less impulsive (which is an important trait to NOT have in a service dog).
Do mixed breeds or purebreds make better service dogs?
There are basically two different types of dogs—purebred and mixes—with advantages and disadvantages to both. Our policy is that each potential candidate should be tested individually to see if he/she has a good temperament without regards to whether the dog is purebred or not. Whether a particular dog is mixed breed or purebred, however, some general knowledge about breeds helps us to narrow the field. It’s all too easy to stereotype a breed and miss the fact that any particular dog can differ in temperament from the breed standard. So, with the caveat that it’s much more important to focus on the nature of the particular dog we are looking at rather than just its breed, we still consider the common traits of specific breeds.
Sidebar: Why do we NOT use Pit Bulls/Pit Mixes?
Note that I personally love pit bulls because they tend to be people-focused, healthy, and smart. Pit bulls have short fur that is easy to care for, and they tend to be both pack motivated and prey motivated, which makes them easy to train. As a 2007 study reports, only 27 percent of male “pit bull type dogs” (which includes both pit bulls and pit bull mixes) in the United States are neutered, thus there is an excess of these dogs to be found in shelters and rescues. Unfortunately, the public image of pit bulls is terrible, so anyone who is trying to own a “pittie” is going to have LOTS of problems with the public. One study reported that pit bull owners were regularly stigmatized “because friends, family, and strangers were apprehensive in the presence of their dogs and because they made accusations about the breed’s viciousness and lack of predictability.” The public reaction to the breed is so widespread and negative that we do not train them for service dog work. Having a service dog is challenging enough—you don’t need to add this factor to the mix.
Goldens, Labs, and mixes are most common, and while various other large breeds can work as service dogs (standard poodles, collies, etc.), they are not widely available as rescues. When looking at rescues, we always keep in mind that each breed has been bred for some particular characteristic but often the trait that is so desirable in a particular breed is quite difficult to live with in our modern lives. Note that I love all dog breeds, but they may not be best for this particular work. So if we do know the breed (or breeds in the mix), we always check the breed standards set by the American Kennel Club before investigating further. I'm always surprised that breed standards are usually more about looks than temperament, but these standards are at least a place to start. If the breed's usual temperament includes words like high energy, watchdog, or tenacious, we usually move on. Sometimes the phrase "Requires an experienced owner" is used to describe a
breed--now, even if the handler is an experienced owner, I wouldn't choose a breed that is noted for being difficult. It's important to realize the stress we put our service dogs under--in part, simply because we require them to live calmly indoors all day. We all are expecting a lot of service dogs, and to add to their difficulties by selecting a breed that is known for being stubborn or aggressive, we're not setting the dogs up for success. Once we start training a candidate, any problematic characteristics that come up will make its life—and ours—harder.
Regardless of the breed, we test a purebred dog the same way we test a mixed breed—that is, we rely on the test results and evaluation period rather than placing too much faith in breed characteristics. We don't consider candidates that are less than forty pounds because smaller dogs are so easily stepped on in crowds (and can thus develop fear or aggression). Sometimes, if we think we'll wind up working with an adult, we'll be willing to work with a German Shepherd, Rottweiller, or other breed that would be fine for an adult.
We don’t train dogs for the blind, but it’s nice to know that the Guide Dogs for the Blind Association in the United Kingdom chooses its dogs similarly to the way we do. “The main breeds used as guide dogs break down approximately into the following classifications: 50% Labrador/golden retriever crosses, 33% Labrador, 10% golden retrievers.” If a dog is good enough for the GDA, it's good enough for us.
One advantage of mixed-breed dogs is that they’re less likely to have inherited diseases. A recent study of mixed breeds vs. purebreds looked at 24 different genetic disorders. For 13 of the genetic disorders, no difference was found between mixed breeds and purebreds, but purebred dogs were found to be more likely to have 10 of the genetic disorders. Unfortunately, the study focused on the number of diseases rather than the prevalence of each disease, so it's hard to draw firm conclusions, but in general, it does seem like mixed-breed dogs tend to be healthier. In other words, there are some inherited diseases that are just as common in mixed-breed as purebred dogs, but unfortunately, there are many inherited diseases that are much more common in purebred dogs.
A disadvantage of mixed-breed dogs is that we have less information upfront about possible temperament issues, such as aggression. So just as with a purebred dog, any time we consider training a mixed-breed dog, we rely on the temperament test results and the evaluation period to determine whether or not that specific dog is a good candidate for service dog work.
 Batt, Lara S., Marjolyn S. Batt, John A. Baguley, Paul D. McGreevy. “Factors associated with success in guide dog training.” Journal of Veterinary Behavior: Clinical Applications and Research 3, no. 4 (2008): 143-151.
 Young, M. S. “Puppy Selection and Evaluation.” Dogs: Companions or Nuisances? (Symposium.) Werribee Veterinary Clinical Centre: Victoria, Australia, 1988: 8-15.
 Beaudet, R., A. Chalifoux, and A. Dallaire. “Predictive Value of Activity Level and Behavioral Evaluation on Future Dominance in Puppies.” Applied Animal Behaviour Science 40, no. 3-4 (1994): 273-284.
 Weiss, Emily. “Selecting Shelter Dogs for Service Dog Training.” Journal of Applied Animal Welfare Science 5, no. 1 (2002): 43-62.
 Jones, Amanda Claire. “Development and Validation of a Dog Personality Questionnaire” PhD diss., The University of Texas at Austin, 2008.
 Smith, Cheryl S. Dog Friendly Gardens: Garden Friendly Dogs. Wenatchee, WA: Dogwise Publishing, 2004.
 Smith, Jason A. The Golden Retriever: A Comprehensive Guide to Buying, Owning, and Training. Minocqua, WI: Willow Creek Press, 2000.
 Brevitz, Betsy. The Complete Healthy Dog Handbook: The Definitive Guide to Keeping Your Pet Happy, Healthy & Active. New York: Workman, 2009.
 Sfetcu, Nicolae. About Dogs. Raleigh, NC: Lulu Press. 2014. E-book.
 MacDonald, Carina Beth. Dog Care and Training: A Complete Illustrated Guide to Adopting, House-Breaking, and Raising a Healthy Dog. Guilford, CT: Knack, 2009.
 Trevejo, Rosalie, Mingyin Yang, and Elizabeth M. Lund. "Epidemiology of surgical castration of dogs and cats in the United States." Journal of the American Veterinary Medical Association 238, no. 7 (2011): 898-904.
 Twining, Hillary, Arnold Arluke, and Gary Patronek. "Managing the stigma of outlaw breeds: A case study of pit bull owners." Society & Animals 8, no. 1 (2000): 25-52.
 Collins, Verité Reily. 999 and Other Working Dogs. York, England: WSN, 2005.
 Bellumori, Thomas P., Thomas R. Famula, Danika L. Bannasch, Janell M. Belanger, and Anita M. Oberbauer. “Prevalence of Inherited Disorders Among Mixed-Breed and Purebred Dogs: 27,254 Cases (1995-2010).” Journal of the American Veterinary Medical Association 242, no. 11 (2013): 1547-1555.