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How long has he had these signs?
Is he on a canned or dry food? Does he eat quickly?
Any changes to his drinking?
Are his gums pink or pale/white? Moist or sticky?
If you press on his belly, does he have any discomfort, tenderness, or tensing?
Could he have eaten something he should not have (ie bones, toys, plants, chemicals, etc)?
Has he had any diarrhea, weight loss, or increased/dilute urinations?