Create a base service and extend for each specific use case.

adoptingAngular_example5.js

// Base service
angular.module('petStoreApp', [])
  .service('petService', function($http) {
    var petSvc = function(_endpoint_) {
      var endpoint = _endpoint_ + '/';
      
      return {
        getList: getList,
        getInfo: getInfo
      };
      
      function getList() {
        $http({ method: 'GET', url: endpoint + 'all' })
          .then(successFn, errorFn);
      }
      
      function getInfo(petId) {
        $http({ method: 'GET', url: endpoint + petId })
          .then(successFn, errorFn)
      }
    };
    
    return petSvc;
  })
  
  // Now our cat and dog services can extend the base service
  .service('catService', funciton(petService) {
    var catSvc = petService('/cats');
    return catSvc;
  })
  .service('dogService', function(petService) {
    var dogSvc = petService('/dogs');
    return dogSvc;
  });