Quick answer
Mustard greens may fit only as a tiny occasional amount for dogs. They should not replace the normal diet.
Use a tiny occasional amount only. This should not become a daily food.
Leafy green safety check
Can Dogs Eat Mustard Greens?
Mustard greens may fit only as a tiny occasional amount for dogs. They should not replace the normal diet.
Preparation
Wash and chop.
Watch-outs
Relevant for bearded dragon green rotation.
Why this answer changes by species
Dogs usually rely on complete dog food. That makes mustard greens different from a generic human-food answer, especially around seasonings, fat, sweeteners, and table scraps.
Related foods for dogs
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Sources used
FAQ
Can dogs eat mustard greens?
Mustard greens may fit only as a tiny occasional amount for dogs. They should not replace the normal diet.
How should mustard greens be prepared for dogs?
Wash and chop.
What should I watch for with mustard greens and dogs?
Relevant for bearded dragon green rotation.