I have a Chihuahua, idk how old, we bought her af adult age over 8 years ago, there's been no real health issues with her to my recollection but over the last week she has been continually having runny poos, specifically around between midnight and 3am, we recently relocated to a different house while our original residence gets prepared to go on market, and its been like this for the last month, she seems to have gotten used to it but the birds have been annoying to the point where she wouldn't eat her usual mince, but will eat other things. her usual waste for the most of or all of the day is solid and healthy, but once it crosses over to midnight/early morning it is always runny, this is the third day this week, second consecutive, the first day was not as messy, the 2nd time was crazy bad, tonight was the cleanest so to speak, as it was all done on the potty pads we have been trying to train her on compared to the other nights.

I dunno what is going on and why it's only this time of day it happens. she gets taken out to the yard for final waste duty before she sleeps in my bed. she's never done anything like this before, any advice helps