Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today
How long has she has these signs?
Did you mean you are tightening her collar because of weight loss?
Any gagging, retching, lip licking, drooling, vomiting, or diarrhea?
Is Tiggs drinking normally? Can she keep water down?
Are her gums pink or pale/white? Moist or sticky?
If you press on her belly, does she have any discomfort, tenderness, or tensing?