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I am sorry to hear you are worried about your dog. My name is Rebecca; I am a veterinarian and will do my best to help.
She could be hyperthyroid, if she is losing weight but has an increased appetite and is more restless.Is she drinking more water than usual?A blood test would tell you if her thryroid level is higher than normal. Having your veterinarian palpate her thyroid gland to feel for enlargement or a lump on her thyroid might indicate this is her problem.
If her thyroid levels are normal, it could be some other hormone imbalance.Is there any vomiting or diarrhea? Sometimes inflammatory bowel disease can cause weight loss with increased appetite, and restlessness from pain/discomfort. Usually but not always there is vomiting and/or diarrhea.
Please let me know if this is helpful and what other questions I can answer.
Please let me know what you find out. Thank you for the great rating.