Deceased Dog Responding?

I was just doing a video of the rain, saying hello to my (deceased) girls when I could swear I heard a “woof” in response. Kinda sounded like my Keisha. However, due to the rain pounding on the tin roof, it’s very hard to hear. My now chronic ear ringing is making me second guess myself. But the reason I’m leaning towards it being legit is that I heard it in real time over to my right. I also noticed my dog looking up. something I’ve seen a few times before with other captured activities. It’s not the first time I’ve heard and/or captured similar sounds, albeit those captures were more audible than this one, fortunately.