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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.
The poisoning may occur a few days after the dog has eaten the onion. At first dogs affected by onion poisoning show gastroenteritis with vomiting and diarrhea, weakness and show little or no interest in food. The red pigment from the burst blood cells appears in an affected dog's urine making it dark colored.