23 Most Aggressive Dog Breeds, According To A New Study

Rough Collies are the most aggressive dog breed, according to a new study of more than 9,000 pets.

Research conducted by the University of Helsinki found that small dogs are more likely to behave aggressively, growling, snapping and barking compared to medium and large dogs. While no dog breed is inherently vicious, some other breeds that exhibit aggression include German Shepherds, Miniature Poodles, and Chihuahuas.

The results, published in Scientific Reports, revealed that male dogs are more aggressive than females, while a puppy’s personality can also affect their likelihood of displaying aggression around people.

“In our dataset, the Rough Collie, Poodle (Toy, Miniature and Medium) and Miniature Schnauzer were the most aggressive breeds,” Professor Hannes Lohi from the University of Helsinki told MailOnline. “Previous studies have shown fear in longhaired Collies, while the other two breeds have been shown to express aggressive behavior towards unfamiliar people.”

Ulrike SteinGetty Images

Elsewhere in the study, the team also found that dogs that spend time in the company of other dogs are less aggressive overall. Not surprisingly, some of the least aggressive breeds include Labrador Retrievers and Golden Retrievers.

jack russell terrier on a meadow with flowers

Anita KotGetty Images

Professor Hannes explains the importance of doing your research before adopting a dog, saying: “As expected, the popular Labrador Retriever and Golden Retriever breeds were at the other extreme. People considering adopting a dog should familiarize themselves with the context and needs. of the breed.”

Take a look at the full findings below…

23 of the most aggressive dog breeds

  1. rough collie
  2. dwarf poodle
  3. Miniature Schnauzer
  4. German shepherd
  5. spanish water dog
  6. Lagotto
  7. chinese crested
  8. German Spitz Mittel
  9. Cotton Tulear
  10. wheat burrow
  11. Other
  12. Pembroke Welsh Corgi
  13. Cairn terrier
  14. border collie
  15. finnish lapland
  16. Chihuahua
  17. smooth collie
  18. jack russell terrier
  19. Staffordshire Bull Terrier
  20. Shetland Sheepdog
  21. Lapland Shepherd
  22. Golden retriever
  23. Labrador Retrievers

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