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I am sorry Rudy has this problem. I think as this has been going on for a few days and things aren't improving a trip to the vet would be a good idea. However, if he is alert, bright happy, eating and drinking and not in pain, I cannot see why it can't wait until tomorrow. But, if he is in pain or is upset then I would get him checked tomorrow. There are many things other than constipation that could be causing him to strain from impacted anal glands, an enlarged prostate, a hernia in the muscles of the bottom area so it is certainly worthwhile getting him checked if it persists. If he hasn't passed faeces and you are certain he is constipated, then vegetable oil added to his food will help lubricate the faeces as well as encouraging fluid consumption to keep the faeces moist.