Yes, even the peregrinos tend to be pretty tame after walking all day.
As for dogs, at one time, they were a problem. Shirley MacClain, in her story of her Camino (book was 2001), she described having dog encounters. However, the Spanish government has seen the value of all those peregrinos walking through and seem to have cleaned up any roving dog issues. The ones we did see were very much under control, either tethered, or caged. I have the feeling there are stiff penalties for uncontrolled dogs. The few that were loose were very well trained and friendly, walking with the owner, and a pleasure. Don't worry about dogs.
We did see some very amusing, extremely large, bright red squirrels one afternoon. They were the largest squirrels I've ever seen.
As for the bicyclists, they are a bigger threat to your safety. It isn't so much the ones yelling, it is the ones that say nothing, and don't ring a bell or anything that are the real danger. They can come up behind you at a very rapid rate and startle the wits out of you. The tendency is to jump to the right or left...don't. They're guessing which way you're going to jump, that can go badly. I usually stay my position, unless I can clearly identify where they are going.
I'm also a bicyclist, and have never come close to hitting anyone. I have a bell and make every attempt to let walkers know I'm there. Many walkers wear ear devices and play loud music, they never hear anything coming, even large trucks. In those cases, I just pass slowly.
In fact, Jane and I are going to the Camino in about a week, and taking our bicycles. We'll ride from Barcelona to Logroño, and then ride from there to Santiago. Using bicycles, we prefer to stick to the roads. They're not mountain bikes and are better suited for road travel. We'll store the bikes in Santiago, then catch a train to Lisbon, Portugal and then walk the Portuguese Camino. Maybe we'll see you along the way Stephen?
Buen Camino!
Dennis