Arlo meets...

... his nemesis,  Black Bag - The Faithful Border Bin Liner !

Yesterday Arlo had seen Black Bag flapping in the wind, working his side-hustle as an electrical extension cover outside our neighbour's house. Arlo was not very impressed at the time and had a good old bark at him. 

Today Black Bag was roaming free, and had the audacity to enter our garden - Arlo would not let this stand! Unfortunately he was moving so quickly I couldn't get a clear photo of his fear, disgust and anger about this invasion of his territory.  (BB did not meet his usual end, I humanely restored him to his former home. )

With many thanks to blipper Letters for his thorough explanation of BBTFBBL.