using the subjunctive with negated dudar

Thinking about using dudar in a compound clause, the dependent clause is subjunctive:

• Ellas dudan que [ellas] puedan ir afuera. They doubt they can go outside.

However, if the subject is the speaker and dudar is negated, we would not use the subjunctive:

• Dudo que pueda ir afuera. I doubt I can go outside.
• No dudo que puedo ir afuera. I don't doubt I can go outside.

I wonder, if there is different subject and dudar is negated, do we use the subjunctive?

• Subjunctive: Ellas no dudan que [ellas] puedan ir afuera. They don't doubt they can go outside.
• or
• Non-subjunctive: Ellas no dudan que [ellas] pueden ir afuera. They don't doubt they can go outside.