There does not seem to be a credit for the female dog's voice. I have checked different sites and no one seems to know, although there has been a few guesses. The one I agree with is that the voice is Catherine O'Hara.
I actually did watch the episode and I do think it was her. She has a fairly distinctive voice and if you listen to the dialogue, it surely seems to match her voice. In her early career she did voice-overs for different cartoons and did continue this work throughout her career.
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