How does DD know what Petunia/Vernon said?

[Hagrid]

No: HPFGUIDX 156694

> Brothergib wrote: <SNIP>
>
> How does DD know that Petunia/Vernon is about to throw Harry out of 
> the house? <SNIP>
> 
> So how is it that DD knows what Vernon/Petunia have just said and 
> then managed to produce an instantaneous Howler to prevent it. We 
> have DD's comment that he has watched Harry more closely than he 
> knows, but we know that DD is at the ministry, so I don't think 
> the 'DD in animagus form' theory would work here. 
> 
> Fawkes? Patronus? Something else?
> 
> Brothergib
>

aussie writes:

good question!

Mundungus's replacement may have been keeping an eye on Harry that
night. (an OOTP member may have kept an eye on Harry over summer since
he started at Hogwarts. As long as no life threatening situations came
up, they were happy to report about bars on his window and aunts
getting blown up)

As for getting the owl/howler there so quickly ... Dobby post?  

aussie