
#4 – Onion

While onions go with pretty much anything savory, they can do more than just make your dog cry.
What's In It:
Onions contain compounds that can be harmful to dogs if ingested enough.
What It Can Do:
Onions can damage red blood cells in dogs causing them to become weaker and move around less. If enough onions are consumed, a blood transfusion might be necessary.
H/T ASPCA
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Jordan Deater
- Edit
Some of the things on here are not true like milk, cheese, bread or bacon.
Patricia Walton
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Every dog I have ever owned has eaten cheese as a treat, not an excessive amount but nevertheless has had cheese, none of them have suffered because of it. My eldest dog was 16 and had cheese as a treat from day one at 10 weeks old and he never suffered.