Lowering a dog’s cholesterol usually starts with a low-fat diet and identifying any underlying health condition driving the numbers up. Normal cholesterol for dogs falls roughly between 135 and 335 mg/dL on a fasting blood test, depending on the lab’s reference range. If your dog’s levels are above that, the good news is that dietary changes alone often bring them back down within a few weeks to a couple of months.
Why Your Dog’s Cholesterol Is High
Before jumping into treatment, it helps to understand that high cholesterol in dogs is frequently a symptom of something else rather than a standalone problem. The most common culprits are hypothyroidism and Cushing’s disease (an overproduction of cortisol). In hypothyroidism, the body’s ability to break down fats slows more than its ability to produce them, so lipids accumulate in the blood. In Cushing’s disease, excess cortisol stimulates fat breakdown and impairs the liver’s ability to clear cholesterol normally. Other triggers include diabetes, kidney disease, and obesity.
Some dogs develop high cholesterol without any identifiable underlying disease. This primary, or genetic, form is especially common in Miniature Schnauzers and Shetland Sheepdogs. Miniature Schnauzers tend toward elevated triglycerides specifically, while Shelties lean more toward elevated cholesterol. In both breeds, the condition worsens with age, and female Miniature Schnauzers tend to be affected more severely than males. If your dog belongs to one of these breeds, routine lipid screening is worthwhile even when they seem healthy.
Risks of Leaving It Untreated
Unlike in humans, dogs rarely develop heart attacks from high cholesterol. The bigger concern is pancreatitis, a painful and potentially life-threatening inflammation of the pancreas that has a well-documented link to elevated blood fats. Dogs with persistently high triglycerides are at particular risk. Untreated hyperlipidemia can also contribute to eye problems, seizures (from very high triglycerides affecting blood flow), and liver damage over time.
Switch to a Low-Fat Diet
A low-fat diet is the first and most important intervention. Your vet will likely recommend a commercial veterinary diet formulated to contain less than 10% fat on a dry-matter basis. These diets replace some of the fat calories with lean protein and fiber, which helps the body process cholesterol more efficiently. Many dogs see meaningful improvement within four to six weeks on a strict low-fat diet.
Table scraps, fatty treats, and high-fat chews like pig ears or bully sticks need to go entirely. Even small amounts of extra fat can undermine an otherwise good dietary plan. If you use treats for training, switch to low-fat options like plain cooked chicken breast, carrots, or green beans. Consistency matters more than perfection on any single day, so get the whole household on the same page.
Fiber Can Help
Adding soluble fiber to your dog’s diet may provide an extra cholesterol-lowering benefit. Psyllium husk, the same fiber found in human supplements like Metamucil, has been shown to reduce cholesterol concentrations and lower the cholesterol saturation of bile. A typical approach is mixing a small amount of plain, unflavored psyllium powder into your dog’s food. Your vet can suggest the right amount based on your dog’s size, but it’s generally well tolerated and also helps with digestive regularity.
Add Fish Oil
Fish oil rich in omega-3 fatty acids (EPA and DHA) is one of the most commonly recommended supplements for dogs with high cholesterol. In a study of working dogs switched to a fish oil-enriched diet for three months, total cholesterol and LDL cholesterol both dropped significantly. The omega-3s gradually built up in the dogs’ systems and reached peak levels around eight weeks.
Look for a fish oil product made specifically for dogs, or use a high-quality human-grade fish oil and dose it by your dog’s body weight. A common starting point is about 1,000 mg of combined EPA and DHA per 30 pounds of body weight daily, but your vet can fine-tune this. Fish oil can also help reduce inflammation, support skin health, and may offer some protection against pancreatitis, making it a useful addition for dogs with lipid problems.
Treat the Underlying Condition
If your dog’s high cholesterol stems from hypothyroidism, Cushing’s disease, or diabetes, treating that condition is essential. No amount of dietary change will fully normalize blood fats if the hormonal imbalance driving them remains unchecked. Dogs with hypothyroidism typically respond well to daily thyroid hormone replacement, and their cholesterol levels often return to normal within weeks of starting treatment. Cushing’s disease requires its own specific management, but lipid levels generally improve once cortisol production is controlled.
This is why your vet will likely run additional bloodwork beyond a simple lipid panel. Thyroid levels, cortisol testing, and liver and kidney values all help pinpoint whether a treatable condition is behind the elevated numbers.
When Diet Alone Isn’t Enough
Some dogs, particularly those with genetic hyperlipidemia, don’t respond adequately to diet and fish oil. In these cases, your vet may prescribe a lipid-lowering medication from the fibrate drug class. These medications work by helping the body break down triglycerides and clear cholesterol more efficiently. In one study of dogs that hadn’t responded to dietary therapy alone, a daily fibrate given with food for 30 days produced significant reductions in both triglycerides and cholesterol. Two Miniature Schnauzers with extremely high triglycerides (891 and 4,398 mg/dL) saw their levels drop to 306 and 419 mg/dL respectively.
These medications are generally given once daily with food. Your vet will monitor liver values while your dog is on them, since fibrates are processed through the liver. They’re considered safe for most dogs but aren’t a first-line option when simpler strategies haven’t been tried yet.
Monitoring Progress
After starting a new diet, supplement, or medication, expect your vet to recheck blood lipids in about three to six weeks. That first recheck tells you whether the current plan is working or needs adjustment. If levels haven’t improved enough at the initial dose or diet, your vet may increase the intervention and test again in another three weeks. The general approach is to reassess every three weeks or so until numbers stabilize, with a maximum adjustment period of about nine weeks before considering a different strategy.
Once your dog’s cholesterol is under control, most vets recommend rechecking lipid levels every six to twelve months, or sooner if your dog shows signs of illness. Blood should always be drawn after a 12-hour fast for accurate results, so your vet will likely ask you to withhold food the morning of the appointment.
Practical Steps to Start Today
- Eliminate high-fat treats and table scraps immediately, including cheese, fatty meats, and greasy chews.
- Transition to a low-fat diet over five to seven days by gradually mixing the new food with the old to avoid digestive upset.
- Start a fish oil supplement dosed appropriately for your dog’s weight.
- Increase exercise if your dog is overweight. Even moderate daily walks help improve lipid metabolism and support weight loss.
- Keep a food diary for a few weeks so you can report exactly what your dog is eating when you go back for a recheck.
Most dogs with high cholesterol respond well to these changes, especially when an underlying condition is identified and treated. The key is consistency with the diet, patience through the monitoring period, and working with your vet to adjust the plan based on what the bloodwork shows.