@Perikles: You're right, "potencialmente peligroso" should be some kind of pleonasm.
But I agree with Sosia's explanation.
A "perro peligroso" is a dog that has already shown some aggressive behaviour (or another feature that would be harmful) and a "perro potencialmente peligroso" is a dog that for some kind of reason (breed, illness, training) could become harmful for people (or for other animals).
@Carmen: Bienvenida de regreso.
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