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In the times that I can satisfy her, it makes things all the better! But it'll differ from canine to canine. For example, with my littler girl, what gets her turned on is when she standing I'll reach under her and rub her belly/nipples. She'll often start grabbing my arm with her paw and trying to direct it towards her vulva for stimulation. If I ignore her, or put my arm down, she'll literally sit, vulva down, on my hand, then get up and start huffing and demanding attention. It's a shame she doesn't like being topped, but she sure does love humping the hell out of my finger and will quickly orgasm when I give into her demands.
Fun stuff!