No, onions are not safe for your dog to eat. Coming from the allium family of plants, It is known to carry toxic content for dogs that can cause hemolytic anemia. It means that the red blood cells in the body are destroyed at a rate faster than their replacement is made by the bone marrow.

Symptoms after eating onions:

Following are the symptoms to look out for after your dog eats onions, raw or cooked:

  1.  Higher heart rate with increased salivation
  2. Reddish or brownish urine
  3. Excessive lethargy or weakness
  4. Vomiting and/or diarrhea
  5. Lack in normal coordination

What substance is bad in onions? 

Vegetables such as onions, garlic, leeks, and chives all come from the allium family of plants. Allium poisoning is known to cause hemolytic anemia in animals.

What to do if your dog eats onion? 

The symptoms as mentioned above may or may not show immediately after your dog has consumed onions. In some cases, it can also take a couple of days for these symptoms to show up. It has been found that the symptoms associated with onions show when dogs have ingested (at a single time) more than 0.5% of their own body weights. Please take your dog to a vet immediately once you identify the signs.

Note: Some dogs might show no symptoms after eating onions but that does not mean than they can be fed onions. Always avoid feeding onions to your dogs.