Here's what I recommend:
1. Vet visit: This is the most crucial step. Your vet can perform a physical exam, run blood tests, and possibly other tests to determine the underlying cause.
2. Describe the symptoms: Provide your vet with detailed information about your dog's weight loss, appetite changes, and any other unusual symptoms. Mention the specific garbage-eating behavior, as it could be a clue to a nutritional deficiency.
3. Consider potential causes: Some possible causes of sudden weight loss in senior dogs include:
* Dental problems: Painful teeth can make eating difficult.
* Parasites: Internal parasites can cause malabsorption of nutrients.
* Cancer: This is a possibility, but hopefully not the case.
* Kidney or liver disease: These conditions can affect appetite and metabolism.
* Diabetes: Less likely, but possible.
* Thyroid problems: A hormonal imbalance can lead to weight loss.
4. Be honest about feeding practices: Share your dog's feeding routine and the types of food you give her. This will help your vet assess her dietary needs.
5. Follow your vet's instructions: Your vet may recommend dietary changes, medications, or further tests.
In the meantime:
* Don't force feed your dog: This can be dangerous.
* Secure your garbage: This will prevent her from eating potentially harmful items.
* Offer small, frequent meals: This can encourage your dog to eat if she is struggling with a full bowl.
It's essential to remember that I am an AI and cannot provide medical advice. Seek immediate veterinary care for your dog.