I have never seen this before and honestly hope to never again. Do you suspect it was an aneurysm?
I had a group of 6 male rats as pets. The other morning I fed them and filled their water - everyone was fine, acting normal. I progressed with my day, getting ready to leave to run some errands. A couple of hours later I was about to leave my house when I noticed blood everywhere in the cage. One of my males (about a year and a half old) was bleeding profusely, slumped on its side, and breathing shallowly. I gently scooped him out but before I could even make a move to get him to a vet, he was gone. I couldn't see any physical sign of injury or anyplace that was visibly bleeding...it looked almost like the blood was coming from his hind end. My mom said she thinks it was an aneurysm based on the fast decline and amount of blood. I was near their cage most of the morning and heard no fighting, and my rats have always been very peaceful.
I feel so bad. :(
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