"This is one dog."
Translation:Seo aon chù.
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Because of the aon one – it causes lenition of the following word.
It is explained in the tips and notes to the lessons. You can read them on the web browser version of Duolingo (unfortunately not in the mobile app :() at https://duolingo.com. You can also read them at https://duome.eu/tips/en/gd.