For me, it helps.
This evening Radar went out and played in the sprinkler. Oh, we weren't watering our lawn. This was just for the dog's entertainment. He went out once, came in a muddy, stinky mess but he enjoyed it so much, I let him out again, and this time I videotaped him.
Here is a video of Radar having fun in the water.
Certainly, if I was writing about much Radar enjoys water, taking a video of him would help my description. I could watch the clip several times so as to not miss a single bit of his antics.
As we watched him play, my husband said, "We really can't stop him from going crazy about water, can we? I mean, isn't it in his genetics to love water?"
That made me think. What comes naturally for the main character in my WIP? What kind of gestures do they do and how do they carry themselves without even thinking about it? Making movies in our head, and watching people helps us writers make each character distinctive.
What crazy stuff does your pet cat/dog/albino python do?