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.
Different breeds of dog also tend to have very different personalities – with some more likely to lash out with nips, nibbles and even bites.
Of course any dog is capable of delivering a damaging bite, while most dogs of any breed are unlikely to do any damage unless seriously provoked, but there are certain breeds who have temperaments making them more likely to be aggressive than others.
Researchers in the USA carried out a survey of some of the estimated five million canine bites suffered in the country each year, separating them into types of dog.
Here are the 12 of the breeds of dog they found were most likely to bite.
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5. Pekingese
Beloved as classic lapdog and companion dog - they were first bred as such by members of Chinese royalty - the Pekingese is very territorial and may nip if they feel crowded or threatened. If you aren't a familiar face, you probably don't want to risk picking up a Pekingese. | Canva/Getty Images
6. Border Collie
The Border Collie is the world's most intelligent dog breed, but they have been bred to herd and protect livestock - using their teeth if necessary. They may well give a nip while playing or exercising with their owner, but a stern word will let them know it's not acceptable. In every other way they are a loving and gentle family dog. | Canva/Getty Images
7. Chow Chow
The Chow Chow is a fiercely loyal and protective dog, meaning that there's no danger of their owner getting a bite. Issues can arrive when they think their owner is being threatened, or simply if they take against a stranger, leading to a chance of a bite. It means they should be kept under strict control all the time. | Canva/Getty Images
8. Rottweiler
Another dog designed to herd and protect, the Rottweiler sometimes gets a largely undeserved reputation for being aggressive. Most Rottweilers are very gentle dogs, but if they are not trained properly they can have a dangerous habit of lashing out in self defence when the actual threat level is small. | Canva/Getty Images