Yes sometimes the bacteria in ponds or lakes evaporates in large enough drops so that the rain is still very pondish and lakeish. You have a good nose.

Lucky dog.

Already fertilized water for free!

I live near two creeks and the rain stirs up the water and smells like that during heavy rains often.

Yeah, many times. Usually after a long hot dry spell.

You will noticeit more around lakes and large ponds.

It was at a shopping center so there was no wilderness getting stirred up.