[Moved from General to Health]
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If the poop is stuck because there's something attached to it, like a strand of hair or string, then try snipping as much of it off as possible, but don't pull on it.
If the poop is stuck because he's dehydrated and it's probably the urate that's stuck inside of him, unfortunately you'll have to let him work it out by himself. Try the warm
bath soak, but if that doesn't work, try giving him 0.25 ml of olive oil (as a lubricant).
If all else fails and it'd been a few days, a vet visit is your only option.
Good luck and let us know how he is.