Tag Archives: data

02/4/14

Aggressive Breeds via Owner Accounts

Establishing ‘aggressive breeds’ without using dog bite data: Using owner reports to establish the most aggressive dog breeds

 

ResearchBlogging.orgIn 2008, data was published on the ‘most aggressive dogs breeds’, with dachshunds, chihuahuas, and jack russells, coming out on top. Recently, various media reports having been reappearing on my newsfeed on this study, with titles like “The 3 Most Aggressive Breeds Revealed“.

Before we begin, please do acknowledge that I adamantly against BSL. I am heavily influenced by research and evidence and, currently, all the evidence points to breed specific legislation never being effective in reducing the incidence of dog bites, in any place globally.

That being said, because I am interested in science, I am interested in studies like this.

So what can this study teach us about aggression in particular dog breeds?

Cindy the Jack Russell Terrier: In the top three aggressive breeds according to this study.

A Jack Russell Terrier: in the top three aggressive breeds according to this study.

 

The Flaws in Breed Aggression Research

Aggression is a difficult characteristic to assess in dogs.  There are a variety of methods that researchers have used, and all have their ‘downsides’.

Using dog bite statistics is not the best course, as most dog bites go unreported, the dog breeds involved cannot be verified and, even if they are verified, it is impossible to understand how many dogs of that paricular breed exist in the community.

If you’re only looking at caseloads from behavioural clinics, then this data is likely to be biased.  Generally, people with larger and more dangerous (because of their size) dogs are more likely to seek help, as are people who have dogs aggressive to members of their family. (This article doesn’t mention it, but finances also play a role here – only those owners with the finances to attend behavioural clinics would be represented in such a study.)

There has been some popularity in behavioural tests (cough – D&CMB proposal – cough) where they do threatening or scary things to a dog and score their responses.  The problem with this is how this actually relates to the ‘real world’ and the aggression the dog displays in everyday life.

When you ask owners about their dog’s behaviour, their experiences and responses are subjective. And ‘experts’ aren’t much better, with many of them representing ‘shared stereotypes’ whether conclusions from their own experiences.

 

Study Design

In this particular study, C-BARQ was used. C-BARQ has a good record as being pretty reliable when it comes to asking owners what their dogs are like, temperamentally.

Members of 11 AKC club (‘club sample’) and vet clinic clients (‘online sample’) were invited to partake.

1,553 C-BARQs were completed by the club sample, with 29 excluded as they did not meet criteria.

8,260 C-BARQs were completed by the online sample, with 1,257 excluded for being mixed breeds or with no breed indicated, and 2,051 excluded as there was less than 45 of that breed represented – so in the end the sample was 4,952 responses for 33 different breeds.

They were rated on aggression towards strangers, owners, and other dogs.

 

Summarised Findings

The online sample and breed club sample differed in some ways.  Breed clubs submitted more intact dogs, more female dogs, and older dogs than those in the online sample. Despite this, the results were quite consistent across the two samples.

Dog aggression was the most common and most severe type of aggression in the study, but dog aggression was not correlated with aggression to people. This supports the widely held view that ‘dog aggression’ does not indicate a risk to people. Similarly, aggression towards household-dogs was not associated with aggression towards other dogs or people. From the data in this study, more than 20% of Akitas, Jack Russell Terriers, and Pit Bulls had serious aggression towards unfamiliar dogs.

When it came to aggression towards people, the highest rates were found in smaller breeds, ‘presumably’ because aggression from smaller (and so more manageable and less dangerous) dogs is more tolerable.

When it came to aggression towards owners, more than half of the aggressive displays towards owners were associated with the owner taking food or something else away from the dog.

While fear in animals is associated with aggression, fear was not strongly correlated with aggression in this study. Some dogs were aggressive but not fearful, some were fearful but not aggressive, and some were fearful and aggressive.

A quote from the study on their findings,

“Although some breeds appeared to be aggressive in most contexts (e.g., Dachshunds, Chihuahuas and Jack Russell Terriers), others were more specific. Aggression in Akitas, Siberian Huskies, and Pit Bull Terriers, for instance, were primarily directed toward unfamiliar dogs. These findings suggest that aggression in dogs may be relatively target specific, and that independent mechanisms may mediate the expression of different forms of aggression.”

Screen shot 2014-02-02 at 5.01.31 PM

Further results on a more breed-by-breed basis (breeds listed alphabetically):

  • Akitas rated higher for aggression towards other dogs than other breeds.
  • American Cocker Spaniels rated higher for aggression towards their owners than other breeds.
  • Australian Cattle Dogs rated higher for aggression towards other dogs than other breeds, and also rater higher for aggression towards strangers.
  • Basset Hounds rated higher for aggression towards their owners than other breeds, but were below average when it came to stranger directed aggression.
  • Beagles rated higher for aggression towards their owners than other breeds.
  • Bernese Mountain Dogs were among the breeds least aggressive towards people and dogs, and ranked below average on stranger directed aggression.
  • Boxers rated higher for aggression towards other dogs than other breeds.
  • Brittanys were among the breeds least aggressive towards people and dogs, and ranked below average on stranger directed aggression.
  • Chihuahuas rated higher for aggression towards people (both owners and strangers) and higher for aggression towards other dogs than other breeds.
  • Dachshunds rated higher for aggression towards people (both owners and strangers) and higher for aggression towards other dogs than other breeds.
  • English Springer Spaniels rated higher for aggression towards other dogs than other breeds, and also rated higher for aggression towards owners. Showed bred English Springer Spaniels were more aggressive than field bred lines.
  • German Shepherd Dogs rated higher for aggression towards other dogs than other breeds.
  • Golden Retrievers were among the breeds least aggressive towards people and dogs, and ranked below average on stranger directed aggression.
  • Greyhounds were among the breeds least aggressive towards people and dogs, and ranked below average on stranger directed aggression.
  • Jack Russell Terriers rated higher for aggression towards people (both owners and strangers) than other breeds and higher for aggression towards other dogs than other breeds.
  • Labrador Retrievers were among the breeds least aggressive towards people and dogs, and ranked below average on stranger directed aggression. Field bred labradors were more aggressive than show bred labradors.
  • Pit Bulls rated higher for aggression towards other dogs than other breeds.
  • Siberian Huskies ranked below average on stranger directed aggression.
  • West Highland White Terriers rated higher for aggression towards other dogs than other breeds.
  • Whippets were among the breeds least aggressive towards people and dogs, and ranked below average on stranger directed aggression.

 

Warning against reaching conclusions on the genetic basis of aggression…

The authors caution, “Demographic and environmental risk factors for the development of canine aggression need to be investigated across a variety of breeds so that both generalized and breed-specific influences can be identified.”

 

So what do you think? Are these studies results consistent with your experiences?

 

Reference:

Deborah L. Duffy, Yuying Hsu, & James A. Serpell (2008). Breed differences in canine aggression Applied Animal Behaviour Science, 114 (3), 441-460 DOI: 10.1016/j.applanim.2008.04.006

View PDF.

 

Further Reading

More on C-BARQ: Can breeders breed better?

06/3/13

Where do puppies come from?

First there was Oscar’s Law, who have vilified the pet store trade, calling their producers ‘puppy mills’, and calling for people to adopt animals from shelters and rescues instead.

The RSPCA joined in, with “Close Puppy Factories” and PetRescue with “Where do puppies come from?“.

And the flow on affect was the sin of breeding dogs, with breeders as a whole being criticised, being called ‘greeders’, crucified for any profit they make from puppy sales.

The government had to act, bringing in codes that make dogs ‘Clean and Kennelled‘, which legitimises the practice of keeping dogs on concrete for sanitisation reasons.

And while the production of puppies in puppy farms is objectionable, does it really deserve this much attention?

Where do puppies really come from?

After a lot of research, the best estimate I could get is that there are approximately 450,000 dogs and puppies sold in Australia each year (source: ACAC paper 2009 PDF).

After even more research, I began to see where all these dogs and puppies were coming from. A complete list of sources is at the end of this post, but below is a table showing a breakdown of the numbers.

Table of Dog Sales in Australia

So the question Where do puppies come from? is best answered with We don’t know.

And that’s really case. If the 450,000 number is correct, then we have almost 250,000 dogs a year coming from an unknown source.

Let me put that in a graphic for you:

Graph showing where dogs and puppies come from in Australia.

 

 

So who are these unknown breeders of the undocumented sales?

 

Backyard Breeders

While ‘backyard breeder’ is a generic and undescriptive term, it is probably the most likely producers of the majority of Australian dogs.  Backyard breeders are people who occassionally breed (accidentally or deliberately) the dogs they happen to have in the backyard, either motivated by profit or romantic ideals (i.e. “every bitch should have a litter” or “the kids should see the miracle of birth”).  These sales are unrecorded.  Puppies often go to ‘friends’ or ‘friends of friends’ or they’re advertised in classifieds and given to whoever shows up with a few green bills. These dogs can be of any breed or cross, especially when accidental.

 

Working Dog Breed

By ‘working dogs’, I mean dogs bred for working stock like cattle or sheep.  While there are a few working dog registries, I had trouble finding the actual numbers of registrations (but I’m very happy to be informed!). These dogs are deliberately bred for their herding instincts, and are typically sold to working homes (such as other farmers who need stock dogs). These dogs are typical border collie, kelpie, huntaway or similar types.

 

Pig Dogs

‘Pig dogs’ are bred for hunting wild boar in Australia, and their ferocity and size are important factors in these breedings. Pig dogs are probably far-less common than the BYB and working dog bred types, and there’s probably some overlap between BYBers and pig dog breeders.  These dogs are generally large crossbreeds, commonly large bull breeds crossed with sighthounds or scenthounds.

 

Camp Dogs

Many of Australia’s indigenous people live on settlements with a number free ranging dogs.  Though these dogs are often owned (that is, there is normally a person or a family that identify a number of dogs as ‘theirs’), they are often unconfined and freely breed with one another.  Some of these dogs get rehomed through rescue groups like Desert Dogs, and some get desexed on site through groups like AMRRIC.  Camp dogs are often smooth-coated dogs with large prick ears, but not always. They are true mixed breeds which do not look like any breed in particular and come in a variety of colours, types, and sizes.

 

Flaws in the Data

While every attempt has been made to make this analysis as accurate as possible, some of the data used is inevitably flawed.

The figure of 450,000 dogs and puppies sold in Australia annually is an estimate.  It is unclear if this is only dogs and puppies sold (so if it does not include ‘give aways’ or dogs that stay in the same home from whelping to death).  I have also seen this figure of 450,000 quoted as being just the number of puppies sold in the country annually, and not inclusive of adult dogs.  I have used this number in the broadest sense – that it includes puppies and dogs, sold and given away.

The rescue sales are hard to conceptualise. Though many rescues use PetRescue for rehoming, not all do.  Those that do don’t necessarily list all animals available on PetRescue. It’s possible that PetRescue data duplicates some of the rehoming by the other rescue groups listed. So, all the rescue stats, from PetRescue and others, are sketchy at best. This especially true considering many groups do not publish their statistics.

While all dogs bred by ANKC breeders out of ANKC dogs must be registered, that doesn’t mean that they all are. The number of dogs bred by ANKC breeders is probably higher (but not much) than that listed.

I tampered with the greyhounds figure a bit. While national registrations are put at about 13,000, we know that many greyhounds aren’t registered.  If we work on greyhounds having an average litter size of 6.5, then the figure of 20,000 is a lot more conceivable. (The figure of 13,000 has the average greyhound litter size of 4!)

I just wanted to acknowledge that my data is probably partly inaccurate, but I don’t doubt the overall conclusions I have reached from this data. That is, while some bits may be a little bit off, the whole thing is probably not a lot off.

 

So what does this mean?

By far the biggest producer of dogs are unknown.  We can speculate that they are the backyard breeders, the working dog breeders, the pig dog hunters, or the free ranging dogs on indigenous camps, but without more extensive research we can’t really work out who is our biggest dog-sellers, except that it is likely to be one of these groups.

But it raises the question: If we are concerned about the breeding and sale of dogs in Australia, are registered breeders and pet shops really the people that we need to be going after?

 

Further reading:

How puppy mills contribute to killing in our pounds (conclusion: they don’t).

The National Animal Interest Alliance produces similar statistics, but for the USA – most puppies come from ‘amateur’ or ‘mixed breed’ breeders.

Why getting pets out of pet shops doesn’t stop puppy farmers

 

 

References: Continue reading →