Probably bleeding in the stomach.
Puppies can tolerate milk but adults can not. They will get diarrhea and will throw up.
Take this animal to the vet. It could be an equlibrium problem, caused by a number of things.
In dogs, a hookworm infection can often show no symptoms. When it does, the dog may have tarry or bloody diarrhea, anemia, weight loss, emaciation, and weakness progressing as the infection remains. Hookworm infections can be treated by dewormer medicines, and prevented by heartworm preventives.
By secreting an irritating chemical, the worm causes a blister to form on the skin surface. This chemical also causes nausea, vomiting, dizziness, and diarrhea.
If you are concerned, you should probably go to the vet. Changes in diet, or stress can cause diarrhea. If it lasts for more than a day you definatly should go to the vet, because diarrhea is dehydrating.
Wow, a 13.9lbs diarrhea, that's one massive diarrhea, I dread to think how big your dog is!!
This could indicate parvo which affects all dogs to greater or lessor degrees. A vet check up is indicated.
Yes, sometimes dogs can be euthanized when they're sick, especially if the dog has a sickness that is not easily treatable or causes the animal to be in a lot of pain.
No
Ring worm
Yes. This is canine influenza.
Yeah but they'll get diarrhea