[Ed]

It is a prolapse.

http://www.dendroboard.com/forum/general-health-disease-treatment/7859-bubble-coming-out-butt.html

http://www.dendroboard.com/forum/general-health-disease-treatment/5035-help-rectal-prolapse.html

and you may want to read http://www.dendroboard.com/forum/care-sheets/16433-emergency-supportive-care.html

 

[Ed]

There are a lot of potential causes of prolapse.. including but not limited to parasites, calcium insufficiency, septicemia, osmotic imbalance..

If the cause isn't identified and corrected, then it is likely to reoccur.

Ed