Yes, but it’s not a good idea. While Swiss chard is not toxic, it can cause or complicate other medical issues with your canine because the vegetable contains some compounds that can be harmful.
While packed with vitamins and minerals, Swiss chard also contains calcium oxalate, which, over time, can lead to kidney and bladder stones. While having stones isn’t fatal, they are painful and their removal may require surgery, which is always a risk for dogs. Other leafy vegetables similar to Swiss chard that also contain calcium oxalate and should be avoided by dogs prone to kidney or bladder stones are beet greens, kale, leeks, okra, parsley, quinoa, collard greens, and roots of beets.
In small doses, Swiss chard (and other calcium oxalate-containing vegetables) should not harm your dog, however, given the wide variety of options that can be given as treats, most experts suggest feeding your canine something else as a treat.
Cucumber, carrots, and green beans are each guilt-free options that are healthy for dogs.
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