[thumbmania]

hi,
I have two american shorthairs. one male and one female. Today, when i was checking their sand, i saw some drips of blood in both in the sand and on floor. It is not a constant thing. It is my first time to see my cat bleed. I am not sure which one bleed, the male or female... they are not sprayed, they are about 4 months old. They also moved to three new places and recently they rode airplane with me b/c i had to move. I heard that cats sometimes bleed when they are in stress.. could you guys tell me what is causing my cat to bleed.?
Thank you very much for your help and advices guys.