I was bitten by a golden retriever when I was 12. It looked friendly so I went to pet it, and it sunk a canine into my arm. I was just unlucky (and slightly stupid) though, and it didn’t rip my face off, so I think I did ok overall.
A German shepherd also tried to bite me when passing it on a narrow path, but it just shredded my jacket pocket.
A Yorkshire terrier also had a go at me once, but didn’t make it through denim jeans.
You could also convert cars by putting harder valve seats in, not sure if this happened a lot at the time, or whether it’s more for classic cars that are worth enough to make sense to do. I don’t think the lead was primarily an anti knock additive, more of a valve and bore lubricant