Experienced and professional animal trainer provide their insights in answering this question :
A. Puppies are always picking up tummy bugs as they are trying to eat everything and what they eat can change the color of their feces! Ensure that his worming treatments are up to date. If he has any other symptoms with it for example vomiting, lethargy etc then contact your vet as soon as possible.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

Very dark or black color may be from eating too much organ meat (like kidney, liver, and heart). Green dog poop can be from large amounts of grass or greens in your dog`s diet, but it can also signal a parasite. See your vet if the changes persist for 1-2 days to be safe.
Green: Green stool could indicate that your dog is eating grass, perhaps to soothe an upset stomach. Black or maroon: This could be a sign of bleeding in the stomach or the small intestines. Red streaks: This is another sign of bleeding, probably in the lower gastrointestinal tract or colon.
Black dog poop can be caused by a number of issues, including, indigestion, parasites, internal bleeding, bacterial infections, pancreatitis, or toxic indigestion. Seek veterinarian advice when you dog has black poop because it could result in a severe problem if left untreated.
Black or tar coloured faeces indicates that there is blood present in your dog`s digestive tract, this is called `melena`. Black blood tells us that the problem is likely to be in the upper digestive tract (stomach or small intestine) because the body has already worked hard to try to digest this blood.
An infected dog will appear weak, anemic and have vomiting and diarrhea. The worm cannot be seen with the naked eye. As the hookworm detaches from the intestinal wall, that spot continues to bleed, which can cause a black, tarry stool. A fecal examination can identify this parasite.
When signs of parvo start showing, the stool gets more watery, becoming brownish to black diarrhea with traces of blood. After signs of parvo start to show and diarrhea gets bloody and smelly, it`s a race against time because most dog fatalities happen within 2 to 3 days after the symptoms.
Probiotics, such as yogurt or kombucha, can help restore balance to your intestinal flora. Several other medications and supplements can also cause a breakdown in pigments that turns your stool green. One example is iron supplements.
The biggest concern with black dog poop is that it may indicate digested blood coming from somewhere in the body. If your dog`s stool is black and tarry or sticky, he should be evaluated by a veterinarian right away as this is a serious symptom–called melena.
If the cause of black poop is related to diet, the veterinarian may recommend switching to a different brand of dog food or adding fiber to the dog`s diet. In cases where parasites or bacterial infections are present, the veterinarian may prescribe antibiotics or other medications to clear up the infection.
Melena is a dark, sticky, tarry stool, almost jelly-like. This blood has been digested or swallowed, indicating a problem in the upper digestive tract. You can check whether your dog`s stool contains this kind of blood by wiping it on a paper towel to see if the color is reddish.
Your Dog`s Food Can Cause Black Stool

If your dog`s poop is consistently black or tarry after feeding certain foods, you may need to consider changing foods or giving feeding less organ meat or fish. Certain supplements, especially those high in iron, can also cause your dog`s poop to be darker.

Black. Very dark or even black dog poop can be a sign of stomach ulcers in dogs, or bleeding of the gastrointestinal tract. Black dog poop gets its colour because the blood isn`t fresh – it`s been digested and had time to darken.
When should you worry about black stool? If your black stool looks tarry or sticky and has a strong smell, it might be melena. Melena means you`re bleeding somewhere inside. Internal bleeding is always serious, especially when you can`t tell if it`s stopped.
Black or tarry stools with a foul smell are a sign of a problem in the upper digestive tract. It most often indicates that there is bleeding in the stomach, small intestine, or right side of the colon. The term melena is used to describe this finding.
Certain types of parasites, such as hookworms and whipworms, have the ability to affix themselves to the intestinal wall and nourish themselves on blood, leading to bleeding in the digestive system. This can result in the appearance of black or tarry stool due to the presence of partially digested blood.
Your puppy will vomit and have diarrhea if canine parvovirus is present in their system. Vomit may be clear or a yellow or brown color, and diarrhea will often contain blood and be a light yellow or mustard colored hue.
Parvo smell has a unique very bad-smelling poop that is not easy to forget. The smell has been described as metallic, with hints of blood stench since the virus affects the intestinal walls, and a seemingly sweet scent.
Bleeding in the gastrointestinal tract

The most worrying cause of black poop is bleeding in the GI tract. This type of black poop is known as melena. It is normally very sticky with a foul-smelling odor, and it can also be referred to as tar-like.

Most cases of black stools are from eating black foods or iron supplements. Black stool due to blood indicates a problem in the upper GI tract. Blood in the stool can be detected through a stool test. See your healthcare provider immediately if you have black stool with pain, vomiting, or diarrhea.
Greenish stool could indicate that you have a bacterial infection (salmonella or E. coli, for example), viral infection (norovirus) or a parasite (Giardia) causing a rapid transit “gush” of unabsorbed bile.
pale colored, very foul-smelling, floating stool.
How long does melena last? Depending on the amount of blood loss and the individual`s gastrointestinal motility, melena may continue up to 5 days after the bleeding has stopped.
Temporarily discontinue all oral liquids and food, especially if the animal is also vomiting. This allows the GI tract to rest and may facilitate healing of the lining of the GI tract. Gradual reintroduction of small amounts of bland food may then be instituted if the clinical signs have subsided.
If the blood in your dog`s stool is dark, sticky, and tar-like then it`s Melena, which is the blood that has either been swallowed or digested. This condition points to issues in your pet`s upper digestive tract, esophagus, stomach, or upper small intestines such as parasites, and liver cancer.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My 3 month puppy eats his own poop and is also biting what can I do to prevent this
ANSWER : A. When it comes to poop eating, you want to consider a few things. First off, what is his diet like? Maybe something is lacking in his diet that is causing him to want to eat his own poop. This is the most common reason why dogs eat THEIR OWN poop. Try a higher quality kibble like Taste of the Wild, Ziwipeak, Orijen.. and try feeding three meals per day, instead of the more common two meals per day. Remember to gradually switch his kibble. Add a little bit of the new kibble and reduce the old kibble very slowly.. little by little every couple of days until the bowl is mostly new kibble! You should also be cleaning up his poops IMMEDIATELY after he does them.. I mean like, you have a bag in your hand, and you are low enough to scoop it up RIGHT when he finished so he doesn’t have a chance to eat his poop.

When it comes to nipping there are a few things you can do. First, you should yelp as soon as the teeth touch your skin, stand up, cross your arms, and ignore the puppy until he is ignoring you. Once he is off doing his own thing, swoop down and calmly reward him by playing with him WITH A TOY so he doesn’t nip your hands. Whenever you pet him, or interact with him, you should always have a toy on-hand so you can give it to him. This toy should be a soft braided rope toy that YOU own. This means, your puppy is never allowed to have this toy on the floor, and your pup can never “win” tug games with this toy. This is YOUR toy that disappears when you’re finished playing, and reappears when you want to play. If you keep this up, in a weeks time, your puppy will be so excited to see that toy, that as soon as you bring it out, he stops nipping you because he wants to play with the toy. Another thing you can do is have two bags of toys. Bag#1 is full of chew toys/soft toys/squeaky toys/etc. After one week, Bag#1 disappears and out comes Bag#2. Bag#2 has the same types of toys as Bag#1, and it only stays out for one week. This keeps the toys feeling like new to your pup!

Q. Hello my puppy has been pooping blackish green stool for the past couple days. He is about 5months and was straining to poop the other day.
ANSWER : A. Puppies are always picking up tummy bugs as they are trying to eat everything and what they eat can change the color of their feces! Ensure that his worming treatments are up to date. If he has any other symptoms with it for example vomiting, lethargy etc then contact your vet as soon as possible.

Q. How do I get my dog to stop chewing on things? I kennel her when I leave for a few hours, but I can’t go to the mailbox without her eating something.
ANSWER : A. If she’s young, then this is just normal puppy behavior. Don’t worry about it. The thing about puppies is, they explore using their mouths. If your puppy grabs a coat hanger, or a slipper, you should roll up a newspaper, and smack yourself on the head with it for leaving those things out.. your puppy is going to explore things, that’s normal! It is 100% up to YOU to keep those things away from your puppy when your puppy is unsupervised… even for just a moment.

Remember to never scold your puppy for grabbing these things. They are just curious little cuties, and they don’t chew things up to bother us.. Dogs do not have intentional thought, so they aren’t ever doing anything ON PURPOSE to us.. The most important thing you can do when your puppy is chewing something you don’t want her to be chewing is TRADE her the inappropriate item with a toy of hers, so she understands “no honey, that isn’t what puppies chew on… THIS is what puppies chew on!” and then begin playing with her using her toy to show her that TOYS ARE FUN.. Way more fun than a boring ol’ coat hanger.

Another helpful thing you can do is have two bags of toys. In each bag is many different kinds of toys. Lots of chew toys, lots of soft squeaky toys, lots of rope-type toys, a bunch of balls.. All kinds of things! For one week you have bag#1’s toys out for your puppy to play with.. At the end of the one week, you collect those toys, and you bring out bag#2! The toys will be more interesting/feel like new to your puppy, which will in-turn, make her chew less inappropriate things. Her toys are too fun to care about that dumb Wii-mote that you left laying around.

Hope this helps!

Q. My puppy is urinating a lot. And the lady I gave one of the puppies to said she thinks her puppy has diabetes could my puppy have it to
ANSWER : A. It is not likely that either one of these puppies has diabetes. It is very uncommon for a puppy that young to have diabetes. If your puppy is straining to urinate or is urinating very small amounts frequently and cannot seem to wait for very long between urination, he may have a urinary tract infection. It is quite possible that your puppy is completely normal. I would suggest an exam with your veterinarian and discuss the behavior with them. They may suggest a urinalysis. Your puppy should be going to the vet at 3 week intervals for vaccinations at this age, so you can discuss it when he has his next set of vaccines. The other person with the other puppy should also be taking hers to a vet for proper immunizations and she should also discuss her concerns with her vet.

Q. My 8mo. puppy eats feces. Wedont scorn him for pottymishaps. He hides feces in his bed.I feed him blue buffalo 2 per day. How do I stop this?
ANSWER : A. A lot of dogs do this, and sometimes it is just because feces tastes good.. sometimes it is due to something lacking in their diet.. but a lot of the time, it’s just fun and tasty. The only way to handle this situation is management. You should be cleaning up your two dogs poops immediately when they happen. Scoop them up, throw them into the woods, or into a can. You cannot give your pup access to the poops.

You could also try adding things to your pups diet. Things like canned pumpkin for dogs (not the pie filling you find in the grocery store, that has way too much sugar in it). Or you could feed your dog raw chews like marrow bones, or beef tendons. You’ll have to add things to his diet in order to find out what is missing from it. If you allow him to continue eating poop, even if there is something lacking in his diet, he will continue eating poop when you’ve solved his diet issue because it will become a LEARNED behavior. This means he will continue eating poop because he learned he CAN eat poop. You could also try feeding him three meals per day. Feed him the same amount of food, but break it up into three feedings per day. This could help him feel a bit more full throughout the day.

Clean up your yard, and clean up after your pups immediately when they eliminate outdoors. Do not scold him, there is no need.. it isn’t his fault.

Read Full Q/A … : R

Q. My dog is house trained but has started pooping in the house, why is she doing that?
ANSWER : A. It could be the type of food you are feeding. If you are feeding a lower quality kibble, it will be packed with fillers. These fillers will cause your dog to poop more than is necessary, and it can cause your dog to poop indoors because of the excess poop. Finding a higher quality kibble like Taste of the Wild, Orijen, or a high quality food like Ziwipeak, or Honest Kitchen, will help with that issue.

Remember to NEVER scold for accident indoors. The more you scold, the more fearful your dog is of pooping in front of you, the less your dog will want to poop in front of you outdoors, the more he will poop indoors, the more you scold… it’s a vicious cycle.

Have you been cleaning messes with Nature Miracle? Pick up a bottle, and try cleaning with that instead of regular cleaner. It will eliminate the smells deep down (even to your dog), which will discourage him from potting in that spot again.

Maybe he needs to be taken outside more often, and maybe he needs to be kept outside longer each time. He should be allowed at least 10 minutes of roaming outside before he has to come back inside. Allow him 10 minutes every single time you bring him outside, just in case he has to poop. He needs every opportunity you can give him. Bring him outside every hour if he’s full grown, every 40 minutes if he’s an adolescent (6-10 months), and every 30 minutes if he’s a puppy (2-6 months). If you have a doggy door, you should still be bringing your dog outside yourself to encourage him to stay outside longer, and poop. When he does poop outside, you should praise him, and reward him with lots of treats!

Q. My Shih Tzu had puppies 6 weeks ago. What complete dog food is reccomended to harden stools?
ANSWER : A. If your Shih Tzu is still nursing her puppies it is best to feed her a puppy or nursing formulation. This will help her to make enough milk so that the puppies can continue to grow big and strong! If she is having loose stools, adding in some pumpkin puree to her diet can safely add fiber to bulk up stools some without affecting the puppies. However, if the loose stool continues for a while, scheduling a checkup with your local vet is always best. Have fun with the puppies!

Read Full Q/A … : Dog Food Protein

Q. I’m fostering some now motherless 5 week old Pitbull puppies. There are 5 of them. How much do I feed them? I give them blue buffalo puppy food by wa
ANSWER : A. It should say on the Blue Buffalo on the back under, “puppies” or some sort of age chart. Make sure it’s puppy food.. puppies need extra protein and nutrients. http://bluebuffalo.com/product-finder/dog/?facets=Puppy,Dog_DryFood#

http://www.bullytree.com/wp-content/uploads/2013/08/Feeding-Chart-Blue-Buffalo.gif – On the back of a puppy-food bag from Blue Buffalo it says underneath 3-5 months, “3 to 20 lbs: feed 1/3 – 1 1/4 cups per day” and “21 to 50 lbs: feed 1 1/2 – 3 cups per day.” Make sure you are breaking that up into at least three meals. Let’s say you decide to feed them 1 1/2 cups per day each, then, you should measure that out, and set it aside. Throughout the day, you should offer at least three mealtimes with that set-aside amount. You want to start with the least amount, and then if they seem hungry (licking the floors, begging you constantly for food, whining/crying) feed them a little more until you get it right. Do not overfeed, and try to avoid underfeeding a well.