A year is not a problem with most meds. Take labman's advice and see if that medication can be used for dogs and what the proper dosage is. If you can't find anything, call the vet. They usually don't charge for a phone consult.
Regarding your chihuahua, both posters are probably right. As long as he has not vomited again, his eyes are bright, and he is his normal happy self, I wouldn't worry about it and waste a visit to the vet. I know it is hard with the brood you have, but if you can, try to watch him closely when he is outside and see what he is picking up off the ground.
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