
Obesity in dogs is a serious medical condition that can lead to several health issues, including osteoarthritis, cardiac disease, respiratory conditions, and dermatological problems. To combat this, various diet pills and weight loss drugs for dogs have been developed and are currently being studied. One example is Slentrol, the first U.S.-licensed Microsomal Triglyceride Transfer Protein (MTP) inhibitor, which works by decreasing appetite and food intake. Another drug, Dirlotapide, inhibits the absorption of fats in the intestinal cells, tricking the dog's brain into feeling full after a smaller meal. These drugs are intended to be used in conjunction with a nutritionally balanced diet and increased physical activity to ensure safe and effective weight loss for dogs.
| Characteristics | Values |
|---|---|
| Are there diet pills for dogs? | Yes, there are diet pills for dogs. |
| Brand names | Dirlotapide, Slentrol |
| Drug type | Microsomal Triglyceride Transfer Protein (MTP) inhibitor |
| Mechanism of action | Inhibits an intestinal enzyme (MTP) that aids in the absorption of fats in the intestinal cells. |
| Effect | Decreases appetite and food intake, tricks the brain into feeling full after a smaller meal |
| Dosing | Monthly adjustments based on weight loss percentage in the previous month |
| Side effects | Vomiting, diarrhea, lethargy, mild-moderate elevation in serum hepatic transaminase activity |
| Contraindications | Liver disease, Cushing's disease, receiving corticosteroids, growing/pregnant/nursing dogs, pre-existing ophthalmic or endocrine diseases |
| Manufacturer | Pfizer |
| Availability | Prescription medication |
| Additional tools | BARC (Body Assessment Rating for Canines) online assessment tool |
| Future developments | GLP-1 drugs in the form of treats and toppers, implantable devices for administering GLP-1 drugs |
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What You'll Learn
- Dirlotapide: The only drug shown to be safe and effective for dogs
- Slentrol: The first medication to combat canine obesity
- Side effects of diet pills: Mild side effects can include vomiting, diarrhoea and lethargy
- Obesity in dogs: An estimated 25-40% of dogs in the US are overweight or obese
- Lifestyle changes: Lifestyle modifications, physical activity and diet are essential for improving the health of obese dogs

Dirlotapide: The only drug shown to be safe and effective for dogs
Diet pills for dogs are available, but caution is recommended with their use. Dirlotapide is the only drug that has been shown to be safe and effective for dogs. It is designed to be used in the management of obesity in dogs. The drug works by inhibiting an intestinal enzyme (MTP, or microsomal triglyceride transfer protein), which normally aids in the absorption of fats in the intestinal cells. As the ingested but unabsorbed fat accumulates in the intestinal cell, it triggers a hormonal response that signals the brain to stop eating. In other words, it tricks the brain into feeling full after a smaller meal.
Dirlotapide is sold under the name Slentrol and was developed by Pfizer. It is the first U.S.-licensed Microsomal Triglyceride Transfer Protein (MTP) inhibitor. The drug is designed to be used in conjunction with a nutritionally balanced diet and increased exercise. It is available by prescription from a veterinarian.
The dosing is calibrated so that the dog optimally loses about three percent of its body weight a month. After the target weight is reached, the dog is maintained on dirlotapide for another three months. Once the drug is discontinued, the dog’s appetite will return, and there is a potential for weight gain unless the dog’s diet and exercise are controlled. Side effects, if any, tend to be mild but can include vomiting, diarrhea, and lethargy. Dirlotapide is not recommended for dogs with liver disease, Cushing’s disease, or those receiving corticosteroids, or for growing, pregnant, or nursing dogs.
The safety of dirlotapide has been evaluated in two studies. In an acute tolerance study, 24 beagles (six dogs per treatment) were treated orally once daily for 14 days with a placebo or dirlotapide at 2.5, 5.0, or 10.0 mg/kg/day. In a margin-of-safety study, 38 overweight dogs were also tested. In both studies, sporadic vomiting and loose stools were observed in both the placebo and dirlotapide-treated dogs. Elevations in hepatic transaminase activity were seen in dogs treated with more than 1.5 mg/kg dirlotapide daily, but were not associated with clinical signs or microscopic evidence of hepatic degeneration or necrosis.
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Slentrol: The first medication to combat canine obesity
Obesity in dogs is a serious medical condition that can lead to osteoarthritis, cardiac disease, respiratory conditions, heat or exercise intolerance, dermatological problems, compromised immune function, and increased surgical and anesthetic risks. To address this, Pfizer Animal Health has developed Slentrol, the first U.S.-licensed Microsomal Triglyceride Transfer Protein (MTP) inhibitor designed specifically to combat canine obesity.
Slentrol works by inhibiting the intestinal enzyme MTP, which normally aids in the absorption of fats in the intestinal cells. This accumulation of unabsorbed fat triggers a hormonal response that signals the brain to stop eating, tricking the dog's brain into feeling full after a smaller meal. The drug is designed to achieve a weight loss of approximately 3% per month, which is considered a safe and responsible rate.
The Slentrol Treatment Plan is tailored to each dog, taking into account factors such as breed, age, genetics, and diet. The dosing regimen is adjusted monthly based on the dog's weight loss progress. It is important to note that Slentrol should be prescribed as part of an overall weight management program that includes a complete and balanced canine diet and increased physical activity.
While Slentrol offers a promising approach to weight management in dogs, it is not a cure for obesity. Long-term success requires continued commitment to healthy dietary and lifestyle habits even after discontinuing the medication. Additionally, it is important to consult a veterinarian and perform thorough examinations to screen for underlying conditions before initiating Slentrol treatment.
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Side effects of diet pills: Mild side effects can include vomiting, diarrhoea and lethargy
Diet pills for dogs are available, with one source citing Dirlotapide as the only drug shown to be safe and effective. Dirlotapide works by inhibiting an intestinal enzyme, which aids in the absorption of fats in the intestinal cells. This triggers a hormonal response that signals the brain to stop eating, tricking the brain into feeling full after a smaller meal.
Despite being deemed safe, side effects of diet pills for dogs can include vomiting, diarrhoea, and lethargy. These side effects are generally mild, but it's important to note that they exist. Dirlotapide is not recommended for dogs with liver disease, Cushing's disease, or those receiving corticosteroids, or for growing, pregnant, or nursing dogs.
Another medication that has been mentioned is Slentrol, which is the first U.S.-licensed Microsomal Triglyceride Transfer Protein (MTP) inhibitor. It works by decreasing appetite and food intake, and is designed to achieve a weight loss of about 3% per month, a safe and responsible rate.
The availability of these medications marks a significant milestone in treating canine obesity, as veterinarians now have additional tools to help manage a dog's weight. However, it is crucial to exercise caution when using any diet pills, and they should always be used under the guidance of a veterinarian.
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Obesity in dogs: An estimated 25-40% of dogs in the US are overweight or obese
Obesity is a serious and growing problem in dogs, with an estimated 25 to 40 percent of dogs in the US, or about 17 million dogs, classified as overweight or obese. This figure has been increasing, with the 2022 Pet Obesity Prevalence Survey showing that 59% of dogs were overweight or obese, up from 55-55.8% in 2018 and 2017. The true number may be even higher, as many dog owners fail to recognise when their dog is overweight. One study found that 36% of dog owners considered their dog to be of "normal" weight when their veterinary professional classified them as overweight or obese. Owners of small breed dogs were more likely to correctly identify their dog as overweight than owners of large breed dogs. For example, 43% of owners of Labrador retrievers and golden retrievers incorrectly identified their overweight dog as normal, compared to 33% of small breed dog owners.
Obesity in dogs is associated with serious medical conditions, including osteoarthritis, cardiac disease, respiratory conditions, heat or exercise intolerance, dermatological problems, compromised immune function, and increased surgical and anesthetic risks. It is also linked to an increased risk of weight-related disorders such as diabetes, hypertension, and cancer.
To help manage canine obesity, Pfizer has developed the first medication to combat canine obesity, called Slentrol. It is a Microsomal Triglyceride Transfer Protein (MTP) inhibitor that works by decreasing appetite and food intake. It is designed to achieve a weight loss of approximately 3% per month, which is considered a safe and responsible rate. Another weight loss drug that has been shown to be safe and effective in dogs is dirlotapide, which also acts by inhibiting the MTP enzyme, thereby tricking the brain into feeling full after a smaller meal.
In addition to medication, it is important for dog owners to implement healthy feeding behaviours and exercise regimens to help maintain their dog's weight loss. A high-quality commercial diet is recommended, as home diets may not provide adequate nutrition, especially in terms of fat-soluble vitamins A, E, and K. Exercise is also crucial, and veterinarians can help owners establish new, healthy habits to manage their dog's weight.
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Lifestyle changes: Lifestyle modifications, physical activity and diet are essential for improving the health of obese dogs
While there is a diet pill that has been developed specifically for dogs and proven to be safe and effective, lifestyle changes, physical activity, and diet are essential for improving the health of obese dogs. Obesity in dogs is associated with dire health consequences and a potentially shorter lifespan.
Lifestyle Modifications
Lifestyle modifications are crucial in preventing and managing obesity in dogs. Firstly, it is essential to provide dogs with regular mental stimulation to prevent boredom, which can lead to overeating. Interactive toys, puzzle feeders, and enrichment activities can challenge your dog's cognitive abilities and enhance their overall well-being. Additionally, it is important to note that dogs should not be put on a diet without consulting a veterinary healthcare team. A high-quality commercial diet formulated for calorie restriction may be recommended by a veterinarian. These diets typically have a lower energy density, are higher in protein and fibre, lower in fat, and have a higher concentration of vitamins and minerals.
Physical Activity
Exercise plays a vital role in weight management and overall health for dogs. Aim for at least 30 minutes to an hour of moderate to vigorous exercise daily, including walking, running, hiking, or swimming. It is important to ensure that the pace is brisk enough to elevate your dog's heart rate for sustained aerobic activity and weight loss. For dogs with limited mobility, low-impact exercises such as swimming or walking on an underwater treadmill can be recommended by a veterinarian.
Diet
Dietary changes are crucial in improving the health of obese dogs. It is important to focus on balanced nutrition and portion control. The ideal diet will depend on the dog's age, breed, size, and health, so consulting a veterinarian is essential. In general, it is important to limit treats, as they are often calorie-dense, especially those high in fat or sugar.
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Frequently asked questions
Yes, there are diet pills for dogs. Slentrol (dirlotapide) is a prescription medication for managing obesity in dogs. It is the first U.S.-licensed Microsomal Triglyceride Transfer Protein (MTP) inhibitor, which works by decreasing appetite and food intake.
Slentrol acts by inhibiting an intestinal enzyme (MTP), which normally aids in the absorption of fats in the intestinal cells. As the ingested but unabsorbed fat accumulates in the intestinal cell, it triggers a hormonal response that signals the brain that the dog is full.
Slentrol is deemed safe for use in dogs, but it should be prescribed as part of an overall weight management program that includes a nutritionally balanced diet and physical activity. It is not recommended for dogs with liver disease, Cushing's disease, or those receiving corticosteroids.
Side effects of Slentrol are typically mild and may include vomiting, diarrhea, and lethargy. However, if a dog experiences a complete loss of appetite or anorexia for more than a day, it should be reported to the veterinarian immediately.
In a four-month Slentrol weight-loss study, 97.8% of dogs that completed the study lost weight, with an average weight loss of 11.8%. The treatment plan aims for a safe weight loss of about 3% per month.











































