Dog Poo, How healthy is your Dogs?

Updated: Feb 18

Getting to know the 'typical' daily motions of your own dog is important to be able to tell when things don't look right. Abnormal poop could be a tell tale sign that there is an underlying problem, especially when there are differences in your dog's wellbeing and behaviour. So what should your dog's poop look like and in what cases should you be concerned?

A 'normal' stool will be dark brown in colour and will have a formed sausage type shape (where it has passed through the colon). It will be smooth, easy for your dog to pass and will maintain its shape. It should be easy for you to pick up with a poo bag. In general, the better the quality of diet the more normal looking the stool is likely to be and in less volume compared to a poorer quality diet.

Looking out for the following can give you good insight into your dog's health:

  • Colour

  • Consistency

  • Blood present

  • Frequency

  • Mucous present

  • Foreign bodies

Let's discuss each factor in turn.


The normal colour of a stool is formed by the presence of bilirubin. When the intestinal contents pass through at a normal rate, the colour will be light to dark brown. Persistent changes in stool colour however, should be investigated.

Green stools may be due to your dog eating a lot of grass, the food contents are passing through the gut more rapidly, or it can be caused by giardia - a parasite. A note of caution is that rodent poison will also produce green poo if the dog has consumed any and there is a cause for concern this is a true emergency.

A yellow stool could be due to a liver or pancreatic issue.

Orange stools may indicate a bile duct blockage issue.

If your dog's stools are consistently yellow or orange, it's wise for them to have a check up with the vet. Don't forget to take a sample of poop with you.


If a stool is very loose it may be that your dog is not digesting and processing the food properly in the large intestine. The food may be passing through the digestive tract a bit too quickly.

There are also many disease processes that may result in diarrhoea so if it carries on for an extended period of time, your dog needs to be examined by a vet.

A bacterial infection such as salmonella, campylobacter or small intestinal bacterial overgrowth may cause very loose stools. Viral parvovirus (if your dog is not up to date with annual vaccinations) is a serious and contagious disease. Parasites such as round worm and tapeworm plus the protozoa giardia which can be picked up from the environment in particularly dirty standing water will also cause problems within the gut.

On the other end of the spectrum, hard stools can be a problem and cause constipation. An older dog with a more sedentary lifestyle and not getting the exercise needed to help keep gut motility may produce harder stools. A number of other causes are neurological disease or trauma effecting nerves and muscles to the colon, hypothyroidism, possible obstruction due to eating a foreign body or bones causing hard crumbly faeces and obstruction due to tumours or polyps in the digestive tract.

If your dog is on long term medication, a side effect may be constipation or simply your dog is just not drinking enough. Swapping to a canned food or soaking a dry food will help with this as will perhaps putting multiple fresh water bowls around the house. Splitting meals to 3-4 smaller meals a day so less food is going through the GI tract at any one time will help the gut with digesting smaller quantities. This can help with both loose and hard faeces.


Blood in the stools on more than one occasion must be investigated. Fresh blood may be due to colitis which is from an inflamed colon. Mucus covered stools may happen from time to time and be normal as it is produced to lubricate the colon. Excessive amounts however in conjunction with abnormal looking stools which may be loose or have some fresh blood may be a colitis indicator and veterinary advice should be sought.

Dark, black, tarry looking faeces (Malaena) means the blood has been digested and is coming from higher up in the digestive tract. This is also a condition where veterinary attention should be given.

Frequency of motions

As discussed earlier, a dog may pass faeces in an excessive amount if fed a lower quality food, or if it is being over fed! Poor quality food is often bulked out with a lot of grains. If your dog is not utilising the ingredients when digested they will simply be passed.

Scavenging and eating things like cow pats will of course have an effect on what your dog passes. Your dog may end up passing something that looks like a cow pat itself!

Foreign bodies