Can I Give My Dog Milk of Magnesia?

Can I Give My Dog Milk of Magnesia?Milk of Magnesia is an over-the-counter medicine that comes in a suspended form. It is used as both a laxative and an antacid. This suspension contains magnesium hydroxide which is dissolved in water to make it into an aqueous solution.

Milk of Magnesia is not really made of milk. It only got the name because of its milky appearance. And the high magnesium content also contributed to its overall branding. People use it for treating abdominal disorders such as hyper acidity and constipation. It effective and provides an almost instant relief to patients suffering from these conditions.

But is Milk of Magnesia as effective in treating the same symptoms on dogs? Can it provide relief to the canine breed or is it one of those people medicines that are toxic to dogs?

Can I Give My Dog Milk of Magnesia? Answer: Yes

If you find that your dog is suffering from constipation or hyperacidity, Milk of Magnesia is one of the safest medicines that you can give to your furry friend.

If you already have Milk of Magnesia in your medicine cabinet, ask the vet if it will work for your pet dog’s particular condition. Hopefully, your dog’s condition will improve in just a few hours.

As an Antacid & Laxative

As an antacid, the magnesium contents of Milk of Magnesia acts as a neutralizer in your dog’s stomach. Through the combination of acidic ions and hydroxide ions, water is produced to neutralize the acidic components in the digestive tract. This will lessen the production of acid in the stomach and thus it will lessen the pain too.

When used as a laxative, Milk of Magnesia works to stimulate intestinal movement. When magnesium enters the intestines, it is not readily absorbed by the system. The body will then react by releasing water from the tissues to increase the water content in the present feces that are stored in the intestines. This then results in a normal and regular bowel movement.

It is the magnesium content in the Milk of Magnesia that makes this medicine highly effective. It doesn’t only reduce the production of acid in the stomach but it also stimulates defecation through the introduction of water in the intestines. When given to dogs, it can immediately provide relief for the type of stomach problem that your dog is dealing with.

Hyperacidity & Constipation

A sudden change in diet can cause constipation in dogs. In fact, an abrupt change in the type of food that you give to your dog can also cause diarrhea. That’s why you shouldn’t just change your dog’s diet and even the brand of dog food that you feed your pet dog without the proper transitional process. Mixing small parts of the new dog food to the usual diet will do the trick without causing any stomach upset.

Stress can also make your dog constipated. And just like their human counterparts, stress can also result in hyperacidity. When your dog gets nervous or feels threatened in some way, the stomach can release acid. And this acid when not quickly neutralized can lead to hyperacidity or even ulcer.

You shouldn’t also ignore the fact that constipation and hyperacidity can be a sign of other serious problems (particularly in the digestive tract area). So it would be better if you take your dog to the vet for a check up if the symptoms seem to be recurring and persistent.

Giving Milk of Magnesia

As an antacid, the safe dosage for dogs is 2ml to 5ml given every 4 to 6 hours. And as a laxative, 7ml to 25ml given once a day is sufficient. If you’re using the liquid suspension solution, you can simply add this to your pet dog’s drinking water. It is still recommended that you consult a vet as your dog may have other special needs for his or her particular case.

Caring for Your Dog

It’s nice to know that people medicines like Milk of Magnesia can be safely given to the canine breed. But even so, you should still take your pet dog to the vet for regular check ups.

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{ 12 comments… read them below or add one }

Sheri April, 2015

My 13 pound Pomeranian is very constipated. I tried 1cc of Milk of Magnesia and it’s not working. The vet does not think there is an obstruction.


Heidi January, 2015

I need an antacid for my dog who has bad reflux at night. She usually has Antepsin but it is sold out everywhere. On here it says that Milk of Magnesia is safe to give but, looking at the ingredients, it lists the artificial sweetener Sodium Saccharin in it. I was told this was toxic to dogs and should never be given. I am confused, is Milk of Magnesia safe for dogs or not?


ChiSlave March, 2016

Look for Original Flavor Milk of Magnesia and you will find that unsweetened, unflavored choices are still out there. I have the Phillips version and there are store brands with identical formulas. It might take some research and possibly mail ordering, but fortunately you should be able to avoid those unwanted ingredients.


Lucinda November, 2014

Our vet prescribed Milk of Magnesia for our mini Poodle who contracted a bacterial infection. Our main concern is she definitely does not have constipation; quite the contrary, she has been plagued by diarrhea for the last 2 days. We are wondering if Magnesia will also help to stop the diarrhea. She’s also on Flagyl (metronidazole). It’s been a tough couple of days. Thanks!


Sofie January, 2016

Lucinda, I agree. I left my little Toy Yorkie with the vet for a couple of days with other dogs and contacted a bacterial infection. My Yorkie has been ill with diarrhea for the last 8 days and has lost weight, has blood in her stool. Also wondering if Magnesia will help stop the diarrhea.


Eamon July, 2014

Can you make clearer for me the term ‘Liquid suspension solution’


James July, 2014

Suspension means that the liquid contains small pieces of the drug. This means it is not completely dissolved, not homogeneous, so it is important to shake it or stir it.


Susan December, 2013

What is the measurement for milk of magnesia in teaspoons or ounces? I have nothing to measure ml.


James December, 2013

Hi Susan. As a general rule, 1/2 a teaspoon to 1 teaspoon when using it as an antacid for your dog. For laxative use, it is 1.5 to 5 teaspoons. Please take into account the weight of your dog when using these guidelines. You may want to check with your vet as a precaution before administering it.


Sonora September, 2013

Please heed the previous commenter. Having checked a number of websites for the correct dosage to give a dog as a laxative, the amounts you suggest per pound are up to 50 fold higher than they should be! Please correct your numbers.


James September, 2013

Thanks for bringing this to my attention! I’ve updated the information accordingly.


Coral Snake April, 2012

The correct dosage is 2.5ml – 5ml as an antacid, 7.5ml – 15ml as a laxative. That’s per dog, not per pound.


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