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I am sorry that you have been waiting for a response. I recently just logged onto the site and noted that your question hasn't yet been answered. I am a licensed veterinarian with over 25 years’ experience and would be happy work with you if you are still needing assistance.
Hopefully by now, Casey is better and/or you have had him evaluated by a veterinarian. If there is still anything I can help with please let me know.
That sounds like a good plan. Nothing can replace the benefit of a thorough physical exam. Constipated cats can be very uncomfortable. Good luck with him and please keep me posted if anything else comes up in which I could be of assistance.