Waht is the proper pronoun for this sentence?

Only a panther could have left that footprint, I want to photograph it.

First of all you need a semicolon = ; between "footprint" and "I" to avoid a run-on sentence. Now, do you want to photograph the panther OR the footprint?

Sra

The proper pronoun is "I."

Here are the most common pronouns:
I, me, we, us, my, mine, our, ours
you, your, yours
he, she, it, they, him, her, them, his, hers, their, theirs


As you can see, "I" is the only pronoun that is capitalized, so it is the proper pronoun.

The proper pronoun to use in this sentence depends on the gender of the panther being referred to. However, since the gender of the panther is not specified in the sentence, a gender-neutral pronoun would be appropriate. In this case, you can use the pronoun "it" to refer to the panther.