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Hi. Welcome to Just Answer. My name is***** Thank you for your question about Chloe. She's been with you for a long time with her being 19. As far as her fur becoming clumped, this is most likely due to her just not grooming herself as much. I recently had to let go my 19 year female cat and she had the same thing going on. In her older age, she just didn't have the desire to groom herself as much and the fur clumped. There was no underlying metabolic issue or skin issue causing it. She just didn't do her part. That left my wife and I to brush her regularly to keep them from building up. Sometimes the initial matting / clumping is very hard to brush (impossible) out. We started with a full body shave down as this was just the easiest for us and her. Why is she falling as she defecates? It could be due to arthritis. She may be getting in a position and if she's weak, she just collapses. The other possibility is she's putting a lot of pressure on her chest as she pushes and it causes a vagal response where she briefly passes out. If her stools are getting very firm, she may have some constipation issues that need some help.
That is great that she's eating and drinking fine. I'm hoping that this girl can be with you for a long time more. Give her a good petting for me since I can't!