Lasix (Furosemide) is a drug used to prevent fluid retention in dogs. The prescription medication supports the kidneys in eliminating fluids from the body. It's generally prescribed by veterinarians to treat conditions such as heart failure and fluid buildup in the lungs, according to the website Pet Place. Lasix, Diuride and generic versions of the drug are considered safe for use in canines when prescribed by a veterinarian. However, like all drugs, sometimes side effects occur.
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Fluid Intake
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Dogs on Lasix usually drink more and consequently urinate more frequently, according to the pet informational website 2ndchance.com. When a dog can't consume enough water to accommodate the increased need for fluids, dehydration is possible. Rapid changes in the dog's fluid intake can lead to kidney damage when these side effects aren't immediately treated.
Digestive Tract
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A dog on Lasix can experience nausea and diarrhea. He may also lose his appetite, leading to a weakened state.
Allergic Reaction
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When a dog is allergic to Lasix, itching throughout his body is likely. The itching is sometimes accompanied by a rash. An allergic reaction is rare, but when it happens, it's usually within the first 24 hours of the dog taking Lasix.
Chemical Imbalance
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The drug has been found to cause chemical imbalances -- low blood potassium, in particular -- and can disturb electrolyte levels, according to the All Pets Veterinary Clinic in Macomb, Ill.
Hearing Loss
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Pet Place reports that hearing loss is uncommon but has been detected in some dogs that have received high doses of Lasix.
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