I can only compare from fingering a spayed female.
My bitch is tighter, but smaller overall so that make sense.
She is warmer, but doesn't get super wet. (again she is spayed)
She tends to be really into getting fingered, or really not. There doesn't seem to be a 'warming up' period for her unlike the human women I've been with. There also doesn't seem to be an I'll just sit here and let you do whatever. She either wants it, or doesn't. Nothing in between.
This part is hard to explain but I'll try. The vaginal muscles always seem to be rhythmic. This is tied with her forcing down and humping hard. Not only does she clamp harder, it almost feels like different parts of the canal are constricting at different times and intervals.
Her taste is flat. This may be because she was spayed. Humans tend to be tangier, and have a changing flavor depending on their sexual gratification. I've not given my bitch sexual gratification with my tongue like I can with my finger though.