“Is anyone’s dog fixated on something in their environment? With Prissy, it’s the UPS truck. What is your dog fixated on, if anything? “
My dog had a fixation on the UPS truck/guy, too. She wanted to eat him because he (along with the mailman) was brazen enough to walk up to “her” house uninvited.
Well, there is that kind of fixation reaction, too. :o)
After dark, if Prissy hears any noise outside, she growls like she is ten feet tall and a killer (she weighs 5 pounds). Really, it's sounds like she is going to kill whatever that is. She really goes into protection mode - no more kissy Prissy. I'll tell her, “It's okay” a few times and she stops the growl/bark.