MainCoon/Bengal's question about Chocolate Poisoning

Question

I noticed around 11:00 pm my cat has becoming dyspnec and progressed rapidly to the point of mouth breathing. Within 30-35 minutes he was gone. He had no therapy sx except twice he cried out. No foaming at the mouth or diarrhea. He did have a warm dry nose so I think he became fevered during this rapid and out of the blue decline and death.I did not witness but know my son was eating Reese cups so I wondered-He was completely healthy until last night and it came on so suddenly from nowhere and as my husband was en-route to vet hospital Klaus passed away. could he have gotten into some chocolate?  Poisoning is the only thing I can imagine that could possible acted this fast to a young cat. He had eaten his normal food today, drank water as usual. I have other cat outside and an indoor Maltipoo and am now terrified it could be a poisoning of some sort. Can you give me any ideas as to what could have happened?

Accepted Answer

Chocolate would not have caused those signs.  If he was outside, a poisoning is possible, but heartworm disease or asthma can cause those signs as well in cats.  I'm sorry for your loss.

Chocolate Poisoning in Cats