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I"m sorry to hear of this with your elderly cat. He's likely to be profoundly dehydrated as are most advanced geriatric cats and he hasn't been able to replace his fluid deficit to boot. If you can have an on-call vet attend to him, please do so even if it's just for his receiving subcutaneous fluids and electrolytes. His difficulty swallowing at his advanced age is likely to represent neoplasia (cancer) in his oropharynx or esophagus. Less commonly, a neuromuscular disorder resulting in megaesophagus (a ballooning out of his normally rigid esophagus) or an achalasia (swallowing defect of neurogenic origin) will be present. Please respond with further questions or concerns if you wish.