Working with real estate agents

[Irakli Khakhviashvili]

Hello,

I have a hard time understanding how to work with real estate agents when buying a rental property. I have read in books that having your agent when shopping for houses plays a vital role in successfully closing deals. However, when I'm looking at the properties on Zillow, Trulia, etc. they're usually listed by another agent, not the agent I am working with. So if I like a property I found on MLS and would like to submit an offer can I bring my agent even though it is listed by another agent? Can sellers have more than one real estate agent?

What are the best practices in this situation?