Hi....I am new to this forum and hope this helps me get some advice. I have two littermates, 3 yrs old, females who are spayed and declawed up front. They are indoor cats and have been best friends for 3 years. Last night they wanted to kill each other with ferocity I have never seen. The runt, Leo, acutally pooped twice during the exchanges. Is abrupt behavior change like this cause for concern? Has anyone else seen this, and will it go away? Today the cats are still hissing at each other. Help?!!!!