Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner, but can you tell me:
How long has he had these signs?
Can you confirm that he has been passing urine normally?
Any gagging, retching, lip licking, drooling or vomiting?
Can he keep water down?
Are his gums pink or pale/white? Moist or sticky?
Since he growled when handled, do you think he had any discomfort, tenderness, or tensing in his belly?
Could he have eaten something he should not have (ie bones, toys, plants, chemicals, etc)?