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.
One thing worth considering before making a decision is that some breeds of dog can be very useful to protect your family and home, as well as being a great pets and companions.
Meanwhile, other types of canine are just no good at being guard dogs – lacking the territorialism, courage and alertness required.
Of course there are always exceptions, but in general these are the 12 breeds of dog you shouldn’t trust to guard your house.
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5. Saint Bernard
A classic gentle giant, the enormous Saint Bernard may look intimidating but they have less aggression than a tiny Chihuahua (who make surprisingly good guard dogs). Maybe an unwanted visitor might slip up on this dog's drool, but that's about the only resistance they'll typically put up. | Canva/Getty Images
6. Bassett 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. | Canva/Getty Images
7. English Bulldog
The English Bulldog's forebears would have been superb guard dogs, but this is a breed that has long since had their aggression bred out of them. Now they are unlikely to even stir from napping on the couch should something untoward be happening. | Canva/Getty Images
8. Cavalier King Charles Spaniel
Bred for companionship and cuddles, not protection, the Cavalier King Charles Spaniel is affectionate and trusting. They completely lack the size, aggression, and territorial instincts necessary to deter or confront intruders. | Canva/Getty Images