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Why Is My Dog Drinking So Much Water? What Should I Do?

Why Is My Dog Drinking So Much Water? What Should I Do?

Have you noticed your dog drinking more water than usual? It may be due to a medical condition called hyponatremia, which is basically the opposite of dehydration.

Hyponatremia, also known as low blood sodium, can be caused by over-hydration with fluids. For some dogs, this is caused by heavy panting or strenuous activity, but for others, it can be caused by something as simple as an increase in their food intake.

There are many causes for hyponatremia. below are some of the most common reasons why your dog might have increased thirst.

Section 1: What is hyponatremia? Section 2: How does it happen? Section 3: What are the different causes of a dog's thirst increase? Section 4: How do I treat a dog with hyponatremia? Section 5: Conclusion

What is hyponatremia?

Hyponatremia is the name for a disorder caused by an excess of sodium in the blood. It is similar to sodium imbalances, which can cause water to be absorbed in excess.

Water typically contains about 70 percent sodium, and in hyponatremia, the level of sodium in the blood is diluted to 70 percent or lower.

When the level of sodium in the blood is very low, like it is in hyponatremia, fluid is unable to enter the cells of the body, and the water level in the body can drop.

This causes symptoms of fluid retention in the body, including lethargy, vomiting, and lack of coordination.

Hyponatremia can be caused by eating too much salt or sodium-rich foods, drinking large amounts of fluids, or drinking too much water.

How does it happen?

Low blood sodium can result from any number of factors. Most commonly, hyponatremia happens when an animal is actively working in the heat.

Dogs are more sensitive to heat than us, and so they may stop drinking water, and because their brains can’t properly handle how much sodium is in their bodies, they will lose more than they should.

The body is supposed to use sodium as a buffer between water and our cells, but the brain can’t determine how much it has, so more water is added, causing fluid to build up in the body.

It’s also possible for a dog to get the same symptoms of dehydration without being hydrated. A complete list of causes is available here.

What happens if I don’t treat my dog for it? This can be extremely dangerous, and can even be fatal.

What are the different causes of a dog's thirst increase?

There are several causes that can lead to a dog’s thirst increase:

Constipation Heavy panting Extreme exercise Hypovolemic, or low blood volume, resulting from illness or poisoning Excessive exercise Chronic diseases such as kidney disease or diabetes mellitus Dental disease Dehydration Any of the above can lead to an increase in thirst, but depending on the cause, there may be several reasons.

The following factors are usually not enough to cause a dog's thirst to increase:

Dry, even moisture-free skin Feeling thirsty or (these two are sometimes linked) A lack of appetite Poor quality, unappetizing food Dry nose and mouth Drops of dry blood in the fur Too little, or frequent, drinking What should I do?

How do I treat a dog with hyponatremia?

For dogs that have reached hyponatremia (low blood sodium), the medical approach is to give fluids. A hyponatremia dog usually needs fluid for several days. Most dogs recover after the fluid intake decreases.

Sometimes some medications can be used to prevent anemia if symptoms persist. Hyponatremia can often be prevented by drinking enough water.

If you are concerned about your dog drinking water too much, it may be wise to put a dog-size bowl in your backyard so that your dog can easily access water.

If you are unable to put the dog bowl near your back door, it is probably better to place a large bowl in a location where your dog can easily get to it.


Keeping your dog hydrated and well fed is extremely important for proper pet care. Hyponatremia, however, can be very dangerous.

If you suspect your dog has a hyponatremia-causing medical condition, please seek veterinary advice immediately. It’s a life-threatening condition.


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