Friend, the symptoms Sam is showing are not likely to being neutered. You see, if there was a problem with the neutering you would have seen some type of discharge from the scrotum. In addition, he started vomiting 4 days post surgery which is a long time to find post surgery complications. I believe this may be related to something else. It will be difficult for me to determine the exact underlying cause without a hands on examination. But, common causes are: A simple gastritis, dietary indiscretion, ingestion of a foreign body, infections, etc. to name a few causes. In any case of vomiting the first thing to do is give the stomach time to rest. This is what you can do:
1- Do not give things like Pepto Bismol or imodium. Start him on Pepcid AC (famotidine) 10mg 1/4 tablet every 12 hours for the next 2-3 days. You can buy Pepcid AC over the counter in any pharmacy.
2- No food
or water for 8-12 hours. Need to give his gastrointestinal tract time to rest.
3- After 8-12 hours offer a small amount of water. Wait half hour, if no vomiting, offer small amount of rice (50%) and boiled boneless chicken or ground beef (50%) 4-6 times a day. Keep on this diet for several days then wean into regular diet.
4- If he continues to vomit, lethargic or not eating after doing the above I would have him rechecked by your family veterinarian for a hands on examination and xrays as initial screening test.
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