My little jack russell terror isn't at all bothered by me on a bike.

If it's a little dog (like the dachshunds that chase me on one part of a country road route), I just outpace them. It's usually pretty easy, and they've learned by now that they can't keep up.

Bigger dog? I get freaked out. I almost got knocked over by a lab just a couple days ago, and it made me shake for a while. My boyfriend is a veterinarian and suggests carrying pepper spray, and having it in your hand for parts of a route where you know there are (large) loose dogs.

Treats are a HORRIBLE idea, unless you have already dismounted your bike. If you give a dog a treat to "make nice" after they just chased you, you are essentially rewarding them for chasing bikes, and they are a lot more likely to think "hey, there's that chaseable treat dispenser!!" in the future. Treats are a no.