Yes it works without proguard.
I use proguard in command line with :

java -jar $PROGUARD_HOME/lib/proguard.jar -injars 
$PROJECT_FOLDER/bin/classes -outjar $PROJECT_FOLDER/bin/obfuscated.jar 
-libraryjars $ANDROID_JAR:$PROJECT_FOLDER/thirds/PayPal_MPL_1.5.jar 
@$PROJECT_FOLDER/proguard.cfg

My conf file (proguard.cfg) is

-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-ignorewarnings
-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider
-keep public class * extends android.preference.Preference
-keepclasseswithmembernames class * {
    native <methods>;
}
-keepclasseswithmembernames class * {
    public <init>(android.content.Context, android.util.AttributeSet);
}
-keepclasseswithmembernames class * {
    public <init>(android.content.Context, android.util.AttributeSet, int);
}
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}
-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}

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