... But when they start chasing me (usually at the base of a climb!),I really don't have the time nor the inclination to start wondering about the pooch's upbringing or history of past abuse, or the owner's dog education skills and relationship with said pooch, etc...
That's the exact point I was trying to make. It doesn't matter the breed. All that matters that it's chasing you. I'm just sick of people saying that x type of animal shouldn't be allowed to exist just because some of its representatives are dangerous.
Example: 88% of serial killers are males. 98% of ******* are males. Should we not allow male humans to exist?
I don't think I've been chased by a Chihuahua, but I HAVE been chased by pits, dobermans, and shepards.
Amazingly enough, I have only been chased by a Jack Russel and a Pomeranian. As I would do with a larger dog, I stopped and put my bike between myself and the dog. Large or small, it's teeth will meet metal before it will meet my flesh.
Being accustomed to dogs, I'm not as worried about being bitten as much as I am worried that the dog (large or small) is going to take my wheel out. That's why stopping is better than riding through in my opinion.