Blood in poop

Just adopted out a kitten and the girl messaged me tonight that the kitten had some blood in her stools. I had just switched her off a food with red food dye that was making her poop red and have diarrhea but the photos show it is a bit of blood. She hates car rides and was having a hard time when I delivered her. Any chance this could be stress or maybe connected to the bad food? The lady is freaking out and I'm not sure what to tell her. I said it could be just that her butt has a cut since it's bright colored.

Could be several things. Kittens have incredibly sensitive digestive systems so they get diarrhea easily from food changes. Fresh blood in stool is usually not an emergency, but it should be addressed. Kittens are also prone to worms and parasites. New owners should take the kitten to the vet for a full work up anyway, as that's always a good idea when you get a new pet. 

I completely vetted the kittens minus spay/neuter because I couldn't afford that part, before finding them homes. None of the ther kittens are having problems and it didn't occur until a couple hours of her being at the new home. Just wanted to get some ideas to help the lady out if the bleeding persists. They were all at the vet a few weeks ago for final checks

My kitty just had this problem. We took her to the vet. Vet said that if the blood is red and streaked, it could be a cut in her bum. But our kitty's blood was also kind of mucousy and her poop was soft, so he said it's likely colitis - not chronic, just inflammation in the colon. He have her probiotics and an antibiotic called Tylosin. Haven't seen blood in about a week. Disclaimer: he also said if the blood is mucousy and the remedy doesn't clear it up, that's when they'd test got parasites or do a scope (if she just keeps showing blood in the poop constantly).

I just posted this in another thread- 

"One of my cats had bloody diarrhea for a long time from right when I got her and we could not figure out why. Finally the vet thought it could be a food allergy, but the 'special' diet she was given by the vet (Hills) was pretty crappy with a lot of ingredients that cats would not normally eat. It could be anything- fish, beef, corn, milk, wheat, soy, etc. The only way of knowing for sure is to do an 'elimination diet'. Start with a single protein that your cat has never had. I started with rabbit- canned from Natures Variety and raw nuggets from Primal. Use commercial products to ensure your cat is getting adequate nutrition- taurine, vitamins, etc. Feed her only this food, no treats or anything else, until you see her improve. Once the symptoms have cleared up (should take a few weeks) start adding one more single protein at a time until the symptoms come back- then you know what is causing it. So start with rabbit, then add chicken, if she's fine then add fish, and so on. I found out my cat is allergic to fish, so I now feed her chicken and turkey, and never dry food! I read all ingredients carefully as many foods have fish added for flavour. I found that Friskies chicken pate and chef's dinner work for her, and President's Choice chicken if you can find it where you are. There are of course many good high-end foods as well in better pet stores.

Many people do not realize that cats would not eat fish in nature, unless they found one dead on the shore or something. Cats don't catch fish. They also don't kill large animals like cows, nor do they drink cow milk, or eat corn or soy. They do get some vegetable matter in the stomach of their prey, but this material has been partially digested and broken down by the mouse or bird or squirrel, whatever they are hunting. Cats do need a bit of plant fibre in order to keep their gut microflora healthy- their digestive bacteria."