Any aggression to humans is wrong in a dog and immediate action must be taken. They should have at minimum
1) anticipated the nip and prevent it. Know what the triggers your dog
2) if not instantly give the dog a correction (“no, no bad dog”)
3) apologize over and over and over and over again offering to get you the rabies certificate and take the shots FOR you if needed.
4) Keep apologizing
5) Right NOW that dog needs to be seen by a professional trainer, and if it can be saved get to a class for both doggie but mostly the idiot owner.

OMG What if you were a child on the trail? Your calf level would have been a child’s face!!! As Wild Dingo said I’d be mortified if my dog bit a human. She’s a shelter adopted mutt and not real good with other dogs but she looooves bikes and people on them because well that’s just what’s in the living room bedrooms etc.

Of course you were angry, cancer sucks but also you were attacked, you were bitten! Fight or flight? You fought.

Can you report it? The dog needs to be temperment tested and if it can be saved the owners trained.

On behalf of all dogs, my shelter adopted mutt apologizes, wags, sits on your foot and asks for a cookie and ear scritchies. Mostly she wants cookies.

When my Dad was dying of prostate cancer she would bring him a squeaky toy, maybe her favorite pink bear and drop it at his feet as if to say

“Here, I give you my favorite bear. Would this help?”

She sends squeeky toys.

Noble men regret their ignoble moments and are better because of it.