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You don't. PS animations are not compatible with AE. You can only render a Clip out of PS and treat that further in AE.
You and Lutz might be talking about a different form of Photoshop animation.
But if you're talking about Photoshop CS3 Extended Video layers, you can simply IMPORT the photoshop document as source material. You'll notice that there will be a duration value at the top of the project panel.
After effects will automatically recognize the duration of the PSD document animation settings. If you need to trim the animation to your two frames, you might need to use time remapping and/or some clever editing.
If it's only two frames (!), I would create them as separate layers in Photoshop, then import those two layers as a comp in After Effects. You'll have more flexibility, and more leverage over those elements.
You can download this dog animation file, then import it directly into After Effects as a layered comp, and you should see the elements split out for you: