I looked through the sticky with a list of things toxic to our furry friends, but this was not mentioned anywhere. Two weeks ago my family and I euthanized my 11 1/2 year old female boxer, Tori, due to a monstrous cancerous mass that had taken over her lungs and was moving in on her heart. Our remaining 8 year old male boxer, Wrigley, has always seemed to have nasal passage issues, (for example, every time he gets moderately to super elbow noodle excited, he sneezes over and over like he's trying to clear out somewhere) but he seems to be hacking more often than usual and though he isn't in a condition even comparable to the respiratory distress Tori was in before we decided to put her down, I'm a little freaky about it now. He's due for his 6 month tune up at the vet anyway, but vet visits are always a trial because he is unpredictably aggressive and has to wear a muzzle that, naturally, constricts his breathing. He hasn't had a complete checkup without trying to take the vet or vet tech's face off in a few years. This issue is secondary to my main question though. I burn incense and often have lit candles in my room, where he spends a great deal of his time, as did my female when she was alive. We also had a fire in our home about two years ago that filled the house with smoke (I was away at college) and before he evacuated my father actually had to wander around the house on all fours looking for Tori because she was hiding in my room and wouldn't come out, surely taking in a quantity of smoke. He ended up having to drag her out of the crate and chuck her out my ground floor window to my brother because she refused to walk next to him, haha. Could this have caused her cancer? Can incense cause respiratory distress in a dog like Wrigley whose face construction seems to limit how well he breathes anyway? Should I stop burning it altogether? Has anyone ever heard tell of this? I obviously will be consulting my vet, but I was curious to see what other smash-faced boxer owners have heard. I realize it sounds a little paranoid, so little smoke comes off of an incense burner, but I've been burning it in a small room with limited circulation for years. Thoughts?