diff --git a/src/test/java/es/uvigo/esei/daa/dataset/PetsDataset.java b/src/test/java/es/uvigo/esei/daa/dataset/PetsDataset.java
index 0a917440ddd47d98dde318886d0e37792074c31e..1a791a318fd7757c0ccd5c298047d7c99ed06910 100644
--- a/src/test/java/es/uvigo/esei/daa/dataset/PetsDataset.java
+++ b/src/test/java/es/uvigo/esei/daa/dataset/PetsDataset.java
@@ -5,28 +5,40 @@ import es.uvigo.esei.daa.entities.Pet;
 import static java.util.Arrays.stream;
 
 public final class PetsDataset {
-	private PetsDataset() {}
-	
-	public static Pet[] pets() {
-		return new Pet[] {
-			new Pet(1, 1, "Tom"),
-			new Pet(2, 1, "Jerry")
-		};
-	}
-
-
-	public static Pet pet(int id) {
-		return stream(pets())
-				.filter(p -> p.getId() == id)
-				.findAny()
-				.orElseThrow(IllegalArgumentException::new);
-	}
-	public static int existentId() {
-		return 1;
-	}
-
-	public static Pet existentPet() {
-		return pet(existentId());
-	}
+    private PetsDataset() {
+    }
+
+    public static Pet[] pets() {
+        return new Pet[]{
+                new Pet(1, 1, "Tom"),
+                new Pet(2, 1, "Jerry")
+        };
+    }
+
+
+    public static Pet pet(int id) {
+        return stream(pets())
+                .filter(p -> p.getId() == id)
+                .findAny()
+                .orElseThrow(IllegalArgumentException::new);
+    }
+
+    public static int existentId() {
+        return 1;
+    }
+
+    public static Pet existentPet() {
+        return pet(existentId());
+    }
+
+
+    public static String newName() { return "Nibbles";}
+    public static int newOwner() {
+        return 2;
+    }
+
+    public static Pet newPet() {
+        return new Pet(pets().length + 1, newOwner(), newName());
+    }
 
 }
diff --git a/src/test/resources/datasets/dataset-add.xml b/src/test/resources/datasets/dataset-add.xml
index 9a75a999a98510f7d6d32992877e71772e8f536c..6ddf78ed6dc74bc900b27b05e5ce1b01ff05cd8e 100644
--- a/src/test/resources/datasets/dataset-add.xml
+++ b/src/test/resources/datasets/dataset-add.xml
@@ -14,6 +14,11 @@
 	<people id="10" name="Juan" surname="Jiménez" />
 	<people id="11" name="John" surname="Doe" />
 
+	<pets id="1" owner="1" name="Tom"/>
+	<pets id="2" owner="1" name="Jerry"/>
+    <pets id="3" owner="2" name="Nibbles"/>
+
+
 	<users login="admin" password="713bfda78870bf9d1b261f565286f85e97ee614efe5f0faf7c34e7ca4f65baca" role="ADMIN"/>
 	<users login="normal" password="7bf24d6ca2242430343ab7e3efb89559a47784eea1123be989c1b2fb2ef66e83" role="USER" />
 </dataset>
\ No newline at end of file
diff --git a/src/test/resources/datasets/dataset-delete.xml b/src/test/resources/datasets/dataset-delete.xml
index e49223db335c0f49f7d78cdcb3f27e80e14d30da..4f595a6fc49fd7d61022fdc637103e46f9d18034 100644
--- a/src/test/resources/datasets/dataset-delete.xml
+++ b/src/test/resources/datasets/dataset-delete.xml
@@ -12,6 +12,8 @@
 	<people id="9" name="Julia" surname="Justa" />
 	<people id="10" name="Juan" surname="Jiménez" />
 
+	<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
diff --git a/src/test/resources/datasets/dataset-modify.xml b/src/test/resources/datasets/dataset-modify.xml
index 6e2dfc903798c9e26431fbaf42bea176a05fc59c..a83bc2f60b0bd864f48163aefca7216980dc87a8 100644
--- a/src/test/resources/datasets/dataset-modify.xml
+++ b/src/test/resources/datasets/dataset-modify.xml
@@ -13,6 +13,10 @@
 	<people id="9" name="Julia" surname="Justa" />
 	<people id="10" name="Juan" surname="Jiménez" />
 
+
+	<pets id="1" owner="2" name="Nibbles"/>
+	<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