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Can you please provide some additional information about Louie for me so I can better assist you?
How old is he and what breed?
Is he intact or neutered?
Has he had any blood work checked or a fecal check for internal parasites ?
Any vomiting or diarrhea ?
Thank for that additional information.
So a few things this could be
1. IBD: inflammatory bowel disease: this condition normally has other symptoms such as some vomiting or diarrhea, but it can also just show weight loss.
Sometimes just adding in some probiotics can help this condition. I usually recommend canine fortiflora which can be purchased off amazon.com and mixed into food once a day.
2. Liver, kidney issues can cause weight loss: a physical exam with some blood work would be able to screen for this
3. Pancreatitic insufficiency: this is when the pancreas does not produce enough enzymes to help digest all the nutrients from the food ingested. There is a blood panel to check for this and treatment is adding in canine pancreatic enzyme to each meal.
So I would first try the probiotic, but if he continues to lose weight over the next week we will need to get a veterinary visit and some diagnostics done.
Does this help give you some ideas?
You are very welcome good luck!