"The goose's eye swelled up."

[Baby goose]

It will likely come in different packaging as it’s available in different packaging even here but this is the version I’ve purchased, it can come in liquid or powder form.
https://birdpalproducts.com/products/enrofloxacin-10-liquid-for-birds?_pos=1&_sid=78a0bd41e&_ss=r

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It’s a veterinary often prescribed to dogs, in the U.S.A where I live it’s used off label in poultry.
This is the dosage according to plumb’s veterinary manual.

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Some other options to try for if Baytril isn’t available or doesn’t work are Tylosin

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And doxycycline

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Thank you, you are a very kind person, and it helped me. I'll report the appointment to the veterinarian. It's very helpful.