Can You Treat Constipation With Miralax For Dogs?

Constipation is a common occurrence in many dogs. Thus, it should come to you as no surprise if your dog gets the condition. The good news is it can be easily managed by applying the appropriate treatments.

Let us be clear; however, you should not use just any human laxatives or stool softeners on your dog, no matter the urgency. Most human-prescribed laxatives are much stronger when used on dogs and can cause complications or even death.

Among the exception is Miralax.

About Miralax

Miralax is the common name given to polyethylene glycol 3350 and is also referred to as an osmotic laxative. It is a laxative whose primary function is managing and treating constipation. Miralax is designed for short-term use and can help your puppy’s stool retain more water, which helps it pass easily.

You can acquire this stool softener over the counter, but you should never apply it without your trusted vet’s advice and direction. Your vet will give you recommendations on its right dosage and frequency of use.

Below is everything you need to know about the uses or application, dosage, and possible side effects of Miralax for canines.

Uses Of Miralax In Dogs

When your dog is experiencing constipation, your veterinarian will, on most occasions, prescribe polyethylene glycol 3350 as treatment. It improves the water retention in your dog’s feces, making it lighter and softer. Once soft enough, your dog will successfully pass the stool seamlessly.

Instead of relying on other stimulants, Miralax uses the already present water in your pup’s system to unblock the digestive tract. For this reason, the drug can also be applied to clear your canine friend’s intestines in preparation for an examination.

Miralax Dosage

Normally, your veterinary doctor will prescribe a Miralax dosage per your dog’s condition. This is determined by the severity of constipation, body size, and weight of your canine friend.

Generally, vets direct dog parents to use a ⅛ to ¼ teaspoon for small dogs. Medium dogs follow closely with an acceptable ¼ to ½ teaspoon, whereas ½ to ¾ teaspoon is agreeable for big canines. The frequency for these dosages is every twelve hours, making it twice a day.

The above guideline is only generally acceptable, but it should not be a replacement for your vet’s prescription and directive for your specific pup.

Possible Side Effects Of Miralax

Every drug, with or without a prescription, invites possible side effects. Miralax is no different. Occasionally,  your furry friend may experience nausea, vomiting, and general lethargy.

Also, be on the lookout for allergic reactions such as swelling, difficulty breathing, or hives. If you observe any of these, immediately call our vet or dial pet emergency contacts.

Sometimes, your dog may take too much of the drug, leading to an overdose. The common signs of an overdose include vomiting, abdominal cramping, diarrhea, and dehydration. Overdosing can, in severe cases, cause pancreatitis.

Best Alternative To Miralax

If the side effects of Miralax affect your dog too much, you can try Dulcolax. It is a constipation remedy primarily made for humans but works equally in dogs. Under your vet’s instructions, you can use it to offer temporary relief to your fur baby.

However, dog health experts discourage its use if your dog has a blocked gastrointestinal tract, damaged intestinal wall, or rectal bleeding. Moreover, you should not give it to your dog if it is allergic to Bisacodyl – a stimulant laxative present in the drug.

Dulcolax may cause side effects such as cramping, nausea, and diarrhea. Keep your vet posted if you notice any of these effects.


Dog constipation is nothing new and is a treatable condition, just like in humans. Miralax, aka polyethylene 3350, is considered safe for dogs to aid in constipation relief.

Be sure to follow your vet’s directives when administering the medication and watch out for possible side effects.

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