A study of over 9000 dogs has revealed that smaller older dogs are more likely to be aggressive and snappy as they get older! The study, published in Scientific Reports
, only includes 23 breeds and is not exhaustive. For example, notable breeds like Rottweilers, Dobermans and British Bulldogs are not included. Townsville dog trainer "The Dog Father" said "it depends on the individual dog's temperament, genetics, breed and then how its been raised and whether it's been appropriately socialized and trained."