If I am in my woods with my dog, and it kills a protected species of songbird (which it knows it shouldn't), should I report this? If so, to whom? Should I expect a fine? This hasn't happened yet, but I like being ready, just in case.
You have absolute responsibility for your dog, what it does is always your fault in the eyes of the law. If your dog kills an animal, you are also responsible for reporting it to the department that handles the preservation of wild animals(Naturvårdsverket here in Sweden). A fine might be imposed or if the case is severe, the dog might even be put down in some countries(though this is mostly the case if the attack is on a human).