To approximately what length does an unfed female Wood Tick swell after successfully taking a blood meal?

Answer

Nearly half an inch long

The process of engorgement significantly alters the appearance and size of the female American Dog Tick once she has attached and begun feeding. An unfed female, initially measuring about $1/8$ inch, will swell dramatically as she consumes blood. This swelling can cause her body mass to increase substantially, leading to a length approaching nearly half an inch. During this engorged stage, her coloration also shifts, typically turning a reddish-brown hue, which is often the point at which an unnoticed tick is finally discovered by its host.

To approximately what length does an unfed female Wood Tick swell after successfully taking a blood meal?
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