Some signs of a sick pet hamster include:
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Decreased appetite or weight loss
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Lethargy or weakness
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Changes in behavior, such as increased aggression or hiding
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Wet tail (a condition caused by bacterial infection)
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Labored breathing or wheezing
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Diarrhea or constipation
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Swollen or red eyes
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Hair loss or rough, unkempt fur
If you notice any of these signs in your pet hamster, it's important to consult a veterinarian for proper diagnosis and treatment.