Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner, but can you tell me:
Any vomiting, retching, or diarrhea?
How is his appetite?
Is he straining like he wants to pass feces?
Did he fall, slip or do anything to injure his tail?
Does it look swollen? Or any sores/lumps/redness/etc. under his tail or around the rectum?
Are his gums pink or pale/white? Moist or sticky?
If you press on his belly, does he have any discomfort, tenderness, or tensing?
Could he have eaten something he should not have (ie bones
, toys, rocks, plants, chemicals, etc)?