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Some people will suffer a mild form of an allergic reaction and have minor symptoms including such things as hives. Those with a more serious reaction to onions may even have problems just breathing in the smell of onions without having an allergic reaction that can compromise their health.
Onions are toxic to dogs and cats: they cause anaemia. If you dog has received a toxic dose (not sure what this is, but probably as little as a whole onion) the signs of anaemia are weakness and pale gums. If your dog has eaten onion please take him to a vet. Chalice.