Sounds like Spanish "sé un poni" which means "be a poni"
Why not "this is a pony"?
If I'm not mistaken, that would be Tämä on poni
Sound almost the same in french "c'est un poney".
if i write as an answer "it is pony" - should be accepted... because it's small spelling mistake
Even though "a" is just one letter, it's still an entire word without which the sentence doesn't make sense.
Well, it still makes sense, but it definitely identifies you immediately as someone whose native language is not English.