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Hi this is DRB. If this came on very suddenly then the most likely cause is actually a blood clot to the front leg and that is very serious and your cat needs to see an ER Doc asap. If this came on slowly then this could be several things like an injury or arthritis. But I don't like the mouth being open especially if this came on quickly. I worry about blood clots in older cats.....please let me know if you have any additional questions or concerns as I will check back tomorrow with you. Sincerely, DRB
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Well , maybe......in terms of being a stress that could have exacerbated a condition that may have been sub-clinical. Usually cats are smart enough to seek shade, but if not use to heat and it is very hot this is definitely not good for older cat especially.
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