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Hi. Welcome to Just Answer. My name is***** Thank you for your question. That is good that Dustin is eating normally. Is Dustin a boy or a girl? What did his last stools look like? Has he been in there more posturing to go?
Thanks for that information. That is good that the stools last looked regular as that more than likely means that a colon issue isn't at hand. Ironically, the urinary system is way more of concern here. Male cats can have urethral blockages that happen way, way, way more frequently. He should be absolutely monitored very closely for if he's urinating - if he's in the litter box more and straining, then a urinary blockage would be my primary concern. This is an emergency if he can't urinate.
Him being able to continue to pee is very important. You could get him to your vet and have them quickly check him over prior to your leaving. The other option is to have who ever is checking on him watch the litter box like a hawk to make sure there is urine in there every day. If he's straining to go, vocalizing, or just looking painful - then a blockage may be at hand!
Here is a very good link on the urinary blockage with male cats for you to familiarize yourself with it more.