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Hi there, I am Dr. Kane, and I will do my best to assist you with your pet today. Please give me a moment to type up a response to your concerns. In the meantime- please take a moment to relay any other pertinent information. Sound good?
Yes, I understand your concerns, as fumes from burning plastic can contain harmful toxins. The most immediate concern would be the development of airway irritation which can lead to bronchitis. If they have not developed any sort of cough or breathing abnormality at this point, they are probably going to be OK in this regard.
Unfortunately, there is not much in the way of research or literature regarding long-term effects of plastic fumes in companion animals, but some reports a link between cancer and plastic fume exposure in laboratory animals. I would keep a close eye on appetite and energy for the next few weeks, as there is the possibility for a delayed type of reaction. To be on the really safe side, you can schedule an examination with their veterinarian soon, so they get get checkups, and run some basic lab work to make sure nothing is out of the ordinary.
I hope this has helped. Please let me know if there are any other concerns I can address for you!