it was hanging around the dog run so I did not want to take chances (our dog tries to catch anything "interesting" including bees that would sting her in the face). But I don't want to kill them if they are harmless. Could you please identify one in the pictures?
A garter snake. Harmless but it seems to be fatally injured. Hopefully it was put out of it's pain quickly after the pictures were taken. Snakes have a primitive nervous system that allows them to still be quite alive for quite some time even if their insides are removed. You need to decapitate it to stop them from feeling the pain of injuries.
Canada, why part around are you from? I'm over the border in Maine, close to woodatock, or frederickton but up here the only snakes we get are nonvenomous.
Garter snakes are great for pest control, and they are too small to cause any damage to your birds or their eggs (unless you have freakishly large ones - lol!). I love them. But always better safe than sorry if you're unfamiliar. Now that you know what they look like, you can keep them around.
I had a dog that loved eating bees. She would often have hugely swollen lips in the summer months. Big dog, little brain, I guess.