Last week I lost my Tank. It was not unexpected but a blow none the less. Since then one of my other dogs, Sirius, has been lethargic and not eating a lot. We assumed he was depressed since Tank was the alpha dog and has been with Sirius since Sirius was born. Actually I am still pretty sure he is depressed, but it was to the main problem.
This morning, just because he has been acting odd, I decided I better take a look at his urine and stool. Urine was normal looking, but when he took a dump it was very dark. I knew that mean he was bleeding internally and took him to the vet. He has a stomach ulcer and had lost half of his blood. The good news is the vet does not think he is in serious danger and that it will heal on its own without surgery. They started him on Prilosec, something to coat his stomach, and an antibiotic because his white count was high. Keeping an eye on him and fingers crossed, but I think he will be ok.
The big point here is watching you dog. The vet pointed out that he has never had anyone recognize what black stools meant. I only did because of my medical training and they could have easily been over looked if you didn't know better (I have seen dog poop in many, many different colors).
Anyway, just wanted to put that out there just in case so people are aware of what it can mean.