I never knew a Cocker, either american or english, who had “springer rage.” (Springer spaniels sometimes have that trait. My father was given one of those.) Our family friend had a big kennel here of cocker spaniels, she showed, and she created and published the weekly cocker magazine 50 weeks a year for years way back when (Cockers Calling). None of her cockers had any rage issues. And I lived with a guy in St LOuis who had an english cocker who was very nice. Nervous and high strung, but nice. No rage.
My aunt had a pekinese who used to nip me when I bathed the dog, and my cousin had a chihuahua who nipped our heels when I was a kid. However, these breeds could not kill us, unless we had been attacked by a pack of 20 of them or more. The breeds most responsible for killing people are the pitt bulls and rotties. Statistically, it’s the facts.
My aussie would always nip, especially guys I dated, but they didn’t kill. In fact, the herding dogs are bred not to kill anything. If they kill in the flocks or herds, the dogs are killed. (I buy my aussies from the bench and herding aussie breeders,Las Rocosa. My aussies never nipped the mentally handicapped, as they could always tell if people were mentally challenged. White male dates? Forget it, they got a knee nip. And deserved it.
Dogs which are bred to fight bulls and bears are dogs which can kill you. It’s not an issue of breed bias, it’s an issue of what is a breed bred to do, and while some dogs are bred to point quail, some dogs are bred to hunt wild hogs and hold/kill them.