Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with your wee one today.
Since you noted Rocky's GI signs in the past tense, is he just refusing to eat?
Can he drink? Does he keep water down?
What antibiotic was used?
What color are his stools? Any black stools or blood?
What color was his vomiting?
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)?