Damnation
S03E21 Look Who's Barking
Phoebe experiences a vision of a deadly banshee while updating the Belthazar section of the Book of Shadows, leading her to suspect that Cole is behind it. When the sisters perform a spell to address the situation, it unexpectedly goes wrong and transforms Prue into a dog. After Prue is struck by a car, Phoebe feels immense guilt, triggering the banshee’s wrath and resulting in her own transformation into a banshee.
Season 3 Episodes
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The Honeymoon's Over
Magic Hour
Once Upon a Time
All Halliwell's Eve
Sight Unseen
Primrose Empath
Power Outage
Sleuthing with the Enemy
Coyote Piper
We All Scream for Ice Cream
Blinded by the Whitelighter
Wrestling With Demons
Bride and Gloom
The Good, the Bad, and the Cursed
Just Harried
Death Takes a Halliwell
Pre-Witched
Sin Francisco
The Demon Who Came in from the Cold
Exit Strategy
Look Who's Barking
All Hell Breaks Loose