Can a Chihuahua eat parsley?
Yes, a pinch of fresh parsley.
How much: 1 chopped pinch over his food 2-3 times a week.
Why
It freshens breath, aids digestion and provides vitamin K. Always a pinch: large amounts aren't recommended. Don't confuse it with "spring parsley," a different plant that is toxic.
Parsley in a Chihuahua's diet
Keep in mind how tiny the portions are for this breed: an adult Chihuahua eats roughly 1 to 2.3 ounces (25-65 g) of food a day depending on his weight, and treats shouldn't go over 10% of his daily calories. That's only a small fraction of an ounce. What looks like "a little bite" to us can be half a meal for him.
This information is for general guidance and is not a substitute for advice from a licensed veterinarian. Every Chihuahua can react differently; if in doubt, always check with a professional.