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Hello, this is Dr. Jess. I am sorry to hear about Lily! Can you tell me, has she had any vomiting? Was the poop normal consistency? Or runny? Or harder than usual? Has she had any new treats or foods she hasn't eaten before? Is she on any medications? Can you look at her gums and tell me if they are pink or if they appear pale at all or have little pinpoint dark red spots on them?
Ok, great. Is she having any difficulty breathing at all? Have you noticed if her urine is darker in color or has any blood in it?
Is there any rodent poisons in your home or yard she could have gotten into?
The thing we worry about with dark or tarry colored stools is bleeding in the upper digestive tract. This can be due to many causes, including ulcers, clotting disorders, trauma, foreign bodies, infections and inflammation, tumors, blood from the respiratory tract being swallowed, etc. The digested blood can look black. Sometimes dogs can also eat things that may change the color of their stools, so if she is otherwise normal, it is possible she ate something outside that altered her stool appearance, but if she has another abnormal stool or starts having changes in her appetite/energy level, breathing, urination, or has vomiting, then she should be examined. Here is an article with information on melena (dark or tarry stools as a result of digested blood) FYI: http://www.petmd.com/dog/conditions/digestive/c_dg_melena
Please let me know if you have any other questions regarding your dog. If you do not, please take a moment to CLICK AND RATE our conversation so we can know if you were satisfied with your service and I can get credit for helping to answer your question. Thank you and best of luck!