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Thank you for your question. My name is***** I have been a small animal veterinarian for 13 years. I'm sorry to hear about your boy.
Is there hair in the vomitus when he throws up? At 10 years of age it is possible that the vomiting is something more serious than hairball, such as some kind of systemic disease (kidney or other). You would need to see a veterinarian for a work up to ensure that nothing else is going on.
But if this is truly just hairballs then the best thing to do is eliminated his swallowing of hair. Is he grooming excessively? If he is then I would check for any skin problems, including fleas. If he is long haired I might try shaving him. If you can't do that then daily or every other day treatment with laxatone can help.
Hairballs are usually benign and don't cause serious medical problem. Rarely they can cause a blockage which could be life threatening, but that is very rare.
I hope that helps, but if you have additional questions let me know.
The most effective thing for cats with hair balls is to shave them... especially if they are long haired. I would do that if possible. I would also give lacatone every other day.
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