12:59:48:144 USER_DEBUG [32]|DEBUG|Susc: DopplerListSubscriber__c:{Id=a0246000001nTMeAAM, Contact__c=00346000002O4YvAAK, DopplerList__c=a0046000001OvCGAA0}

Map<String, String> LookupFieldsMap = DopplerListCriteriasUtil.getAvailableLookupObjects();

// Build query with the availableLookups and Fields Mapping
List<DopplerListSubscriber__c> sobjList = Database.query(DopplerSQLBuilder.buildSOSQLDopplerListSubscriber(listId));

Map<String, String> dopplerWrapper = new Map<String, String>();

    for (DopplerListSubscriber__c susc : sobjList) {
        for (String loField : LookupFieldsMap.values()) {

            System.debug('Susc: ' + susc);
            System.debug('LookupFields: ' + loField);
        }
    }