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Hi this is Dr. Hill. Please give me a moment to type my response. Thank you
With what you are describing it is difficult to tell what specifically is going on. However, there are a few rules about seeking emergency care. If the diarrhea is severe (watery) or has any blood then he should be evaluated this weekend. If he is not urinating normally or is making frequent trips to the letterbox then he should be seen emergently due to a concern for urinary tract obstruction. I suspect that he may have a fever. Cats normal body temp is 99-102.9. If his body temperature is over 105, then he needs to be seen emergently. My other general rule of thumb, is that cats that do not eat for over 24 hours should be evaluated as soon as possible. If he goes outside, then there are a number of possible ingestions and exposures. You can start a probiotic, like Proviable or Fortiflora to help with the diarrhea. They can be found at many pet stores or online at Chewy.com. Please ask any follow up questions. You can continue posting on this thread for several days after rating my response. Take care.