How to filter Android logcat by application?

On the left in the logcat view you have the "Saved Filters" windows. Here you can add a new logcat filter by Application Name (for example, com.your.package)

use first parameter as your application name. Log.d("your_Application_Name","message");

and in LogCat : create Filter ---> Filter Name & by Log Tag: is equal to 'your_Application_Name' it will create new tab for your application.