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Hi, Welcome to JustAnswer. You're through to Dr Chris, a small animal Vet based in the UK. I am reviewing your question and will get back to you shortly.
I'm sorry to hear of this with Otto. Indeed vomiting which persists for more than 24hrs should prompt a visit to the vets for a physical examination which may help to narrow down the cause and help to exclude anything more serious going on. Possible causes include gastritis, pancreatitis, a foreign body/obstruction etc. An appropriate course of treatment and any necessary investigations can then be discussed after he has been examined.
I hope that answers your question? Please let me know if you need any further help or advice.
You're welcome. Best wishes