A dog with bad gas and drinking lots of water may be experiencing two noticeable changes at the same time.
The amount of water the dog is drinking, how often it urinates, and whether the gas is occasional or persistent can help provide a clearer picture of what is happening.
In this guide, we explain what it may mean when a dog has bad gas and drinks lots of water, what to watch for, and when veterinary care may be needed.
Table of Contents
Dog Has Bad Gas and Drinking Lots of Water: Why It Happens
A dog with bad gas and drinking lots of water may have a digestive upset along with increased thirst. Eating something unusual, a sudden diet change, food intolerance, or intestinal irritation can cause excessive gas, while thirst may increase after eating salty food, exercising, or losing fluids.
Some medications and medical conditions can also increase water consumption.
The combination becomes more concerning when the increased drinking is persistent rather than occasional.
Dog Has Bad Gas and Drinking Lots of Water: Common Causes
Dietary Changes
A recent change in food is one of the common reasons dogs develop excessive gas.
Certain dietary ingredients can be fermented by intestinal bacteria and increase gas production. Eating too quickly can also cause dogs to swallow more air, contributing to flatulence.
Dietary changes do not usually explain persistent excessive thirst by themselves, however.
If your dog continues drinking unusually large amounts after the digestive upset settles, another cause should be considered.
Related: Dog diarrhea and smelly gas (Causes and what to do)
Eating Something Unusual
Dogs that get into garbage, table scraps, spoiled food, or other unfamiliar foods may develop gas and digestive upset.
Depending on what was eaten, gastrointestinal irritation may also cause diarrhea, vomiting, abdominal discomfort, or changes in appetite.
If the dog ate something potentially harmful or swallowed a foreign object, the situation can be more serious than simple gas.
Related: Dog has bad gas suddenly (Causes and treatment)
Gastrointestinal Disease
Gas can occur with several gastrointestinal disorders, particularly when digestion or intestinal bacteria are disrupted.
Some dogs with gastrointestinal disease also develop diarrhea, vomiting, soft stools, weight loss, or changes in appetite.
Excessive flatulence accompanied by diarrhea or weight loss is more concerning than occasional gas in an otherwise healthy dog.
If a dog with gastrointestinal symptoms is also drinking much more than usual, the increased water intake may partly reflect fluid loss or another illness occurring at the same time.
Diabetes Mellitus
Diabetes mellitus is an important medical cause of increased thirst and urination in dogs.
Dogs with diabetes commonly develop increased thirst, increased urination, increased appetite, and weight loss. Weakness and other complications can also occur.
Gas is not a defining sign of diabetes, so a dog with excessive gas and increased thirst may have two problems occurring together rather than one condition causing both symptoms.
Cushing Disease
Cushing disease, or hyperadrenocorticism, is another condition that can cause a dog to drink and urinate more than usual.
Other signs may include increased appetite, panting, a rounded or enlarged abdomen, muscle weakness, hair loss, thin skin, and recurrent infections.
It is more commonly diagnosed in adult and older dogs.
Gas itself is not a typical defining sign of Cushing disease, so excessive flatulence would need to be evaluated separately if it persists.
Kidney Disease
Kidney problems can interfere with the body’s ability to concentrate urine, which can result in increased urination and increased thirst.
A dog with kidney disease may also develop reduced appetite, weight loss, vomiting, lethargy, dehydration, or other changes depending on the severity and stage of disease.
Because early kidney problems may not produce obvious symptoms, persistent changes in drinking and urination are worth discussing with a veterinarian.
Urinary Tract Problems
A dog may appear to be drinking more when they are actually urinating more frequently.
Urinary problems can change bathroom habits and may sometimes lead owners to notice increased water consumption.
If your dog is repeatedly asking to go outside, having accidents, straining to urinate, or producing unusually large or small amounts of urine, this information is important to tell the veterinarian.
Dehydration or Fluid Loss
Increased drinking can be a normal response when a dog has lost fluid.
Vomiting, diarrhea, heat exposure, heavy panting, or other causes of fluid loss can increase the need for water.
In this situation, the increased thirst may be a response to another problem rather than a primary disease.
If gastrointestinal symptoms are severe or prolonged, dehydration can become a concern.
Heat, Exercise, or Environmental Changes
Dogs naturally drink more after vigorous activity or exposure to hot weather.
A temporary increase in water intake is less concerning when it has an obvious explanation and returns to normal afterward.
Persistent excessive drinking without a clear reason is different and should be evaluated.
Medications
Some medications can increase thirst and urination. Corticosteroids, for example, can produce increased thirst and urination, and long-term steroid exposure can also produce signs associated with hyperadrenocorticism.
If your dog recently started a medication and the increased drinking began afterward, tell the veterinarian rather than stopping prescribed medication without guidance.
Related: Dog has bad gas and not eating (Causes and when to worry)
Dog Has Bad Gas and Drinking Lots of Water but Acting Normal
A dog may have bad gas and drink more water than usual while still acting completely normal.
Mild dietary upset, eating something unusual, or a recent food change can cause gas without immediately affecting the dog’s behavior.
Increased drinking may simply reflect thirst, particularly after exercise or warm weather.
However, normal behavior does not rule out a developing health problem.
Pay attention to whether the dog continues drinking unusually large amounts over the following days and whether urination also increases.
Persistent excessive thirst, especially with weight loss, vomiting, diarrhea, or changes in appetite, should be discussed with a veterinarian.
Dog Has Bad Gas and Drinking Lots of Water and Peeing More
Bad gas combined with increased drinking and urination may reflect two issues occurring together, such as digestive upset and increased fluid intake.
However, persistent excessive thirst and urination can also occur with conditions such as diabetes, kidney disease, Cushing’s disease, or certain medications.
The amount of urine matters as well as the frequency. A dog that repeatedly urinates small amounts may have a urinary problem, whereas a dog producing unusually large volumes of urine is experiencing increased urine production.
If increased drinking and urination persist, particularly with weight loss, increased appetite, weakness, vomiting, or changes in behavior, veterinary testing is appropriate.
Dog Has Bad Gas and Drinking Lots of Water After Diarrhea
A dog may drink a lot of water after diarrhea because it has lost fluid through frequent or watery bowel movements.
Thirst can therefore be a normal response to dehydration, particularly after several episodes of diarrhea. The digestive upset causing the diarrhea may also contribute to increased gas.
However, drinking water does not always mean the dog has replaced all the fluid it lost. Severe diarrhea can cause significant dehydration and electrolyte imbalance.
If diarrhea is persistent or bloody, or the dog is vomiting, weak, lethargic, has dry or sticky gums, cannot keep water down, or continues drinking excessively after the diarrhea has stopped, veterinary care is needed.
Dog Has Bad Gas and Drinking Lots of Water but Not Eating
A dog with bad gas, increased thirst, and loss of appetite may have more significant gastrointestinal discomfort than a dog with gas alone.
Nausea, dietary indiscretion, gastroenteritis, pancreatitis, infection, or abdominal pain can make a dog reluctant to eat while still wanting to drink.
Some dogs continue drinking even when they feel too nauseated to eat, so drinking water does not necessarily mean the illness is mild.
If the dog refuses several meals, repeatedly vomits, develops diarrhea, has abdominal pain or swelling, becomes weak or lethargic, or cannot keep water down, veterinary assessment should be sought promptly.
Related: Dog Has Bad Gas and Bloody Diarrhea (Causes and treatment)
When to Call or Visit the Vet
Contact your veterinarian if your dog’s increased drinking is persistent, clearly different from normal, or accompanied by other changes.
Arrange veterinary assessment if your dog:
Continues drinking much more water than usual
Is also urinating much more frequently or producing larger amounts of urine
Is losing weight despite eating normally or eating more
Develops vomiting or diarrhea
Has persistent or severe gas
Has a reduced appetite or refuses food
Becomes weak, lethargic, or less interested in normal activities
Develops a swollen or painful abdomen
Has changes in urination, including straining or accidents
Has excessive panting or other signs associated with hormonal disease
Urgent veterinary care is appropriate if increased thirst is accompanied by repeated vomiting, severe weakness, collapse, significant abdominal swelling or pain, difficulty breathing, or other rapidly worsening symptoms.
Treatment depends on whether the gas and increased thirst have one underlying cause or are separate problems.
Key Takeaway
A dog with bad gas and increased thirst can have several possible explanations. The gas may be related to diet or gastrointestinal changes, while excessive drinking may be caused by fluid loss, heat, medication, or an underlying condition such as diabetes, kidney disease, or Cushing disease.
Occasional gas with a temporary increase in drinking is less concerning when there is an obvious explanation.
However, persistent excessive thirst—especially when accompanied by increased urination, weight loss, vomiting, diarrhea, appetite changes, or weakness—deserves a veterinary evaluation.