Great Dane!

So, there's this HUGE dog living in my condo building... I think he's a Great Dane or something enormous like that. Every time he and Zoli see each other they both go crazy! The other morning I was taking Z out for his walk (a little later since I was working from home) and I guess this dog was waiting by the patio doors because as soon as he saw us he threw his huge body up against the doors and broke about three of the window panes! It made a horrendous noise and both Z and I jumped about a mile high! I just kept walking since I didn't know if this monster was now working his way through the cut glass to come devour us or what! As we hit the sidewalk I started worrying that maybe instead he was bleeding to death inside his condo. What to do??!! Luckily I saw one of the owners cross the street. I went over, introduced myself, and let her know that either her dog was in the process of escaping... or possibly dying (I'm sure I worded it better than that!). She rolled her eyes and informed me that it was not HER dog, but her roommates! End result, monster dog is fine, windows are taped up, owners are annoyed, Z is still crazy and I am resigned to my new life!