want to adopt rotweiler

Why would the shelter even consider adopting out an aggressive dog? Especially a Rottweiler which is a very strong breed with an already damaged reputation and even more so to a less experienced owner? My concern is for you as well as the dog. That does not seem like a very smart decision on the shelters part. Tread with great caution, I wouldn't like to see you or anyone else get hurt. This has nothing to do with the breed. Any shelter that is adopting out aggressive dogs is really not doing their job. IMO

Curbside Prophet said:

I believe the OP is from a country not known for great shelters.

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Then I would still caution anyone from adopting an "aggressive dog" unless they know what they are doing. I would also ask that it is not a misinterpretation of what the dog REALLY is. Some folks will say the "aggressive dog" referring to a Rottweiler even when the dog in question is sweet.
If you have a good trainer/behaviorist that could help you with this it would be great. Can someone with more experience go and assess the dog first?

To the OP:
I am not sure how much experience you have with Rottweiler's as a breed but there are some videos that give a bit of food for thought before adopting.

http://www.youtube.com/watch?v=s7s1IUxPEmA

http://www.youtube.com/watch?v=R3p3SjPRu0g&feature=related

http://www.youtube.com/watch?v=BWsg4fJThyM&feature=related

http://www.youtube.com/watch?v=A1KuNfSCcW8

I suggest you watch those and also read, read, read everything you can to learn about the breed FIRST. Any info I can help you with, I am more then willing.