Dogs come in all shapes and sizes - the UK Kennel Club recognises 221 different pedigree dogs, from Affenpinscher to Yorkshire Terrier (there are sadly no dog breeds starting with the letter ‘z’!).
Then there are all manner of crossbreeds, from so-called ‘designer dogs’ to lovable mongrels.
Each has its own list of positive and negative attributes, and it’s important to take plenty of time to think about what breed will fit into your lifestyle the best - for instance a smaller dog if you live in a flat, or a hypoallergenic dog if the mere mention of dog hair makes you think about sneezing.
There is even scientific research to guide you, in particular psychologist Stanley Coren’s groundbreaking book The Intelligence of Dogs.
And one thing you might like to consider is that some dogs are naturally better guard dogs than others.
Labrador Retrievers may be affectionate and popular, but they’re likely to welcome a burglar like a long lost friend - particularly if they come armed with a few tasty sausages.
On the other hand, other breeds are naturally suspicious of strangers, ever-vigilant and have the potential to be ferocious if challenged or confronted. It also helps if they look a bit scary.
Here are the 24 best and worst breeds of guard dog.
Make sure you don't miss a moment of breaking news from across Scotland by signing up to our free newsletter here.
1. Pug
Pugs are easy to train because their sole aim is to please everybody they meet - even those they really shouldn't. Their love of a quiet life means they'll avoid drama at almost any cost. | AFP via Getty Images
2. Labrador Retriever
We're starting with the canines that aren't much cop when it comes to protecting owners' homes and property. Labrador Retrievers are the UK 's favourite breed of dog - partly due to their friendly disposition. This counts against them as a guard dog though, while their innate greed means that it tends to only take a couple of treats to get around them. | Getty Images
.jpeg?trim=0,69,0,69&crop=&width=800)
3. Bloodhound
The Bloodhound has the best sense of smell in the canine world so could happily track down a burglar. Just don't ask them to stop the crime in the first place though - they'll welcome all and sundry into their home. | AFP via Getty Images
4. Basset Hound
The Basset Hound is one of the most sociable breeds of dog, well known for getting on with everybody. Unfortunately that includes complete strangers, such as potential intruders. | AFP via Getty Images