Is it grammatical>
The dog lifted its leg on the fire hydrant.
It is grammatically well-formed, but the question is whether the use of "on" is idiomatic. Personally I would accept the sentence, understanding "on" to signify the recipient of an action (with negative effect).
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It is grammatically well-formed, but the question is whether the use of "on" is idiomatic. Personally I would accept the sentence, understanding "on" to signify the recipient of an action (with negative effect).
I see "lifted its leg" as a euphemism for "peed" and would therefore use "on".