It was a fucking Golden Retriever too, a dog breed I would normally trust. Inevitably it was owned by some fuckwit kids who laughed their heads off when, on entering Victoria Park, the do spied me going by and chased off after me.
Luckily it's teeth only painfully scraped my calf and didn't break the skin or my trouser. I guess it turned and ran after that because it immediately got my heel in its face as I pedalled.
I hate people sometimes.