Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today.
Has Charley been straining like he wants to urinate and cannot?
What milligrams was the Zofran? How much does he weigh? How many hours ago could he have eaten that?
Any retching, gagging, lip licking, drooling, grass eating, or vomiting?
When you offer food, does he just turn away?
Are his gums nice and pink (not white/pale)? Moist or sticky?
If you press on his belly, does he have any tensing, tenderness, discomfort, or pain?
Could he have eaten anything he should not have (ie bones, stones, socks, toys, plants, chemicals, human meds, etc)?