Weight loss is something you may notice in your older dog. This is a normal part of aging. But an old dog losing weight might also suggest a serious health problem. Naturally, you want our pets to have a happy and comfortable life. So let me offer some tips to figure out if your dog’s body condition is normal or not. We’ll look at some reasons why senior dogs lose weight and what you can do to help your pet gain some weight back and stay healthy.
Is It Normal for an Old Dog to Lose Weight?
It is normal for a dog’s weight to change over time. Factors like diet, exercise, the environment, and stress can affect how animals eat and burn calories. Of course, these changes are usually minor and temporary.
Veterinary standards suggest that weight loss is clinically significant when it exceeds 10% of the normal body weight and is not associated with fluid loss or dehydration (1). If this is the case in your pup, you’ll need to identify the underlying health problem and seek medical treatment.
You can find out if your old dog is losing weight significantly by taking him to the vet for a weigh-in and check-up.
Reasons for Weight Loss in Senior Dogs
There are various reasons for senior dogs to lose weight. Factors such as underlying health conditions, dental issues, decreased appetite, metabolic changes, or malabsorption can all contribute to an old dog losing weight. These are the most common contributors.
1. A Problem With Their Food
Dogs eat less when they dislike their food. A change in diet may be to blame, or perhaps a large bag of kibble goes stale before your dog finishes it. Feeding too few calories or giving your pup low-quality dog food can also trigger weight loss.
2. Stress
An anxious or stressed dog may find relaxing and eating difficult because they always feel they need to be alert. Many triggers can lead to this situation, including routine changes, moving to a new house, or losing a family member, for example.
3. Exercise
Dogs who exercise more but consume fewer calories lose weight. Physical exercise is very beneficial for canines, but they also need adequate nutrition. You might need to give your pet more food or switch to higher-calorie foods if they act more energetically than usual.
4. The Environment
Dogs need extra energy to stay warm in the cold. Conversely, hot temperatures can reduce their appetite. In an extreme climate, you may need to adjust their food accordingly. For example, you could increase their calorie intake in the winter and reduce it during the summertime.
5. Dental Disease and Other Oral Problems
Any problem that makes chewing and swallowing painful or difficult will discourage a dog from eating. Dental disease is common as they age; they sometimes experience issues like foul breath, bleeding gums, loose teeth, and infections. Other oral problems include tumors, ulcers, or foreign objects stuck in the mouth.
6. Intestinal Worms and Other Parasites
Parasites can cause weight loss in their host animals because they consume their nutrition. Intestinal worms are the most prevalent parasites responsible for this in dogs. Signs of their presence include bloating, diarrhea, vomiting, and malnutrition. Other parasites that may trigger problems include fleas, ticks, mites, and lice.
7. Kidney Disease
Kidney disease can cause weight loss in older dogs by affecting their ability to filter waste products and retain water and electrolytes. As a result, it can lead to dehydration, loss of appetite, vomiting, and increased urination. Kidney issues can also be responsible for anemia and muscle wasting (“muscle atrophy”) in some animals.
8. Cancer
Cancer cells use energy to grow and divide, meaning energy is not available to the animal, so they often lose weight. This terrible disease can also directly affect a dog’s digestive system and appetite; this is more common in seniors than in puppies.
How to Prevent or Reverse Weight Loss in Senior Dogs
Any suspected health problem should be addressed with your vet. However, if your old dog is losing weight because of non-medical reasons or normal aging, you can help them by adjusting their diet.
Feed High-Quality Food for Seniors
Senior dogs actually need more protein than younger dogs to maintain muscle mass. Healthy older dogs may benefit from diets with an increased protein-to-calorie ratio, providing a minimum of 25% of calories from protein (2). Look for foods with approximately 25-30% protein on a dry matter basis and adequate calories for their activity level.
Seniors may need up to 50% more protein than younger dogs to help prevent sarcopenia (age-related muscle loss) (3). High-quality animal proteins combined with plant proteins offer the best nutritional balance for aging dogs.
Blue Buffalo Wilderness High-Protein Natural Dry Food for Seniors is an excellent choice because it is specifically formulated with muscle care in mind. It can help your dog put weight on as it is crafted with a higher meat content and nutritious grains to provide balanced nutrition; this supports overall health and vitality.
Give Your Pup Frequent and Small Meals
Do you want to stimulate your dog’s appetite and prevent them from feeling too full or bloated? Consider frequent and small meals. Managing food portions is a very effective way to boost your pet’s health and activity levels. You might also consider warming up their food or adding some water or broth to make it more palatable and easier to digest. They’ll have a better chance to gain weight at a healthy pace.
Add Supplements and Treats to Your Dog’s Diet
You can boost your dog’s protein and fat intake by mixing cooked eggs, lean meat, fish oil, or cottage cheese into their food. These are healthy supplements that can benefit your dog’s health.
You could also give them fruits, vegetables, or plain yogurt as snacks. They are tasty and nutritious treats that your pup will love. We should always avoid foods high in salt, sugar, or artificial ingredients, as these can be harmful to health.
Monitor Your Dog’s Weight and Body Condition
It’s important to keep track of your dog’s overall physical health. This is easy to do: simply use a scale to measure their weight and a body condition score chart to assess their muscle and fat levels (4).
Ideally, you should be able to feel their ribs (but not see them). They should have a visible waistline when viewed from above. This will help you confirm that your dog is fit and healthy.
Talk to Your Vet About Your Dog’s Weight
If your old dog continues losing weight or the situation worsens, you should ultimately talk to your vet. They may need to run some tests to rule out any medical causes or prescribe some medications or supplements to help them regain weight. Your vet will advise the most appropriate course of action for your pet’s specific situation.
Checklist: Help Your Old Dog Gain Weight and Stay Healthy
The following table lists ways to help an old dog maintain a healthy weight. These tips may also benefit their overall health by keeping them mentally stimulated, hydrated, and comfortable.
| Rule out health issues | Vet check-ups | Quality senior food |
| Weight control | Dental care | Joint supplements |
| Pain medications | Cognitive supplements | Behavior monitoring |
| Moderate exercise | Mental stimulation | Hydration and water |
| More food and meals | Canned or moistened food | High-calorie extras |
| Less stress and anxiety | More beds and blankets | Ramps or stairs |
| Laser therapy | Acupuncture | Massage |
Important: Please consult your vet before making any changes to diet, exercise, or medication!
Source: Photo by Jonathan Daniels on Unsplash
Final Thoughts
When older dogs lose weight, it is not always an undesirable thing. But sometimes it can be a sign of a serious health problem. If your senior dog is looking thinner, check with your vet to find out the cause and the right course of action.
You can help by feeding them high-quality food rich in protein and appropriate calories, more frequently and in smaller portions. Add some healthy supplements or treats to their diet, and monitor their weight and body condition regularly. By doing these things, you can help your old friend stay healthy for as long as possible.
Sources and Further Reading
- Abnormal Weight Loss in Dogs – VCA Animal Hospitals
- Nutrition for Aging Cats and Dogs and the Importance of Body Condition – Journal of Veterinary Internal Medicine
- Nutrition Requirements of Senior Pets – Veterinary Practice
- Obesity and Weight Loss in Dogs – Cornell University College of Veterinary Medicine
- 2023 AAHA Senior Care Guidelines: Nutrition – American Animal Hospital Association
- Senior Dog Health Issues – Veterinary Partner
