One other consideration: condensation inside any horizontal run. My current home essentially has a p-trap in the dryer vent, which has caused me headaches (as it traps water, which traps lint, which blocks flow).
As for the floor pass-through, there are flanges, or boxes, and/or elbows designed for dryer venting, that would be rigid and could be sealed against pests.
Story time: we had a squirrel entry through our vent. The end of the pipe wasn't sealed well enough. The squirrel traveled up the pipe, was stopped by the dryer itself, then chewed its way through the flexible pipe getting into the house.
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