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Hi Sue. Welcome to Just Answer. I'm Dr. Bruce and I've been a veterinarian for 15 years. Sorry for my delay in getting to your question. Since Girl has started doing this dry heaving, has she ate or drank? Does she bring up anything when she's doing the "dry heaving"?
Thank you for all that good information Sue. In a situation like this, sometimes it can be a challenge to know if a cat is dry heaving or coughing. If material is being brought up, then most likely it is a gastrointestinal issue going on. Some can have similar looking respiratory issues and they can be due to allergies, inhaled irritants, or heart issues. With what you're describing, it seems more intestinal / stomach related. I wouldn't think the weather change would set this off. Could it be food related? Honestly with some cats, infrequent vomiting can be due to eating something that just doesn't agree with them. If a new food was fed or a new treat or a plant being chewed on - then the consideration would be there for that being the cause. As far as what an owner can do at home for an acute episode of vomiting, pulling food and water for 12 hours to let the stomach rest is as good as they can do there. If the "dry heaving" continues despite this, could there be some issue with the pancreas? Some primary issue with the intestinal tract and material being there that isn't passing? I would recommend videoing an "event" that you're seeing if possible so your vet can view it if they need to evaluate her if these continue.
As long as she's seeming comfortable and not being stressed, it would seem an ok plan to give her a day or so to see if this continues. Some do very well on their own at regulating the not eating / drinking for that time frame. I'm hoping for the best for Girl!