diff --git a/src/test/resources/datasets/dataset.dtd b/src/test/resources/datasets/dataset.dtd
index e64500f9760310832c4352657d6b41454a653582..9fdeff9e24bfa9b74f0e72aeb5a10e9fbb0da68c 100644
--- a/src/test/resources/datasets/dataset.dtd
+++ b/src/test/resources/datasets/dataset.dtd
@@ -1,14 +1,25 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!ELEMENT dataset (people*, users*)>
-<!ELEMENT people EMPTY>
-<!ELEMENT users EMPTY>
-<!ATTLIST people
-    id CDATA #IMPLIED
-    name CDATA #IMPLIED
-    surname CDATA #IMPLIED
->
-<!ATTLIST users
-    login CDATA #IMPLIED
-    password CDATA #IMPLIED
-    role CDATA #IMPLIED
->
+        <!ELEMENT dataset (people*, users*, pets*)>
+        <!ELEMENT people EMPTY>
+        <!ELEMENT users EMPTY>
+        <!ELEMENT pets EMPTY>
+        <!ATTLIST people
+                id CDATA #IMPLIED
+                name CDATA #IMPLIED
+                surname CDATA #IMPLIED
+                >
+        <!ATTLIST pets
+                id CDATA #IMPLIED
+                name CDATA #IMPLIED
+                owner CDATA #IMPLIED
+                >
+        <!ATTLIST users
+                login CDATA #IMPLIED
+                password CDATA #IMPLIED
+                role CDATA #IMPLIED
+                >
+
+
+
+
+
diff --git a/src/test/resources/datasets/dataset.xml b/src/test/resources/datasets/dataset.xml
index 3f48cc9b6888070b9fb5b4c42bee31f8eae267b6..a4687b04c97364af29cf6bd064df638bdcfbda7f 100644
--- a/src/test/resources/datasets/dataset.xml
+++ b/src/test/resources/datasets/dataset.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE dataset SYSTEM "dataset.dtd">
-
 <dataset>
 	<people id="1" name="Antón" surname="Álvarez" />
 	<people id="2" name="Ana" surname="Amargo" />
@@ -13,6 +12,10 @@
 	<people id="9" name="Julia" surname="Justa" />
 	<people id="10" name="Juan" surname="Jiménez" />
 
+	<pets id="1" owner="1" name="Tom"/>
+	<pets id="2" owner="1" name="Jerry"/>
+
+
 	<users login="admin" password="713bfda78870bf9d1b261f565286f85e97ee614efe5f0faf7c34e7ca4f65baca" role="ADMIN"/>
 	<users login="normal" password="7bf24d6ca2242430343ab7e3efb89559a47784eea1123be989c1b2fb2ef66e83" role="USER" />
 </dataset>
\ No newline at end of file