diff --git a/lesson_16/objects/objects_app/src/main/java/Dog.java b/lesson_16/objects/objects_app/src/main/java/Dog.java
new file mode 100644
index 000000000..541d63f5a
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/main/java/Dog.java
@@ -0,0 +1,80 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class Dog implements DogTest {
+
+  // Custom exception
+  public static class DogAgeException extends Exception {
+
+    public DogAgeException(String message) {
+      super(message);
+    }
+  }
+
+  // Enum for dog colors
+  public enum Colors {
+    WHITE,
+    BROWN,
+    BLONDE
+  }
+
+  // Member variables
+  private int age;
+  private String breed;
+  private String gender;
+  private Colors color;
+  private boolean isFed;
+  private List<String> favoriteToys;
+
+  // Constructor
+  public Dog(int age, String breed, String gender, Colors color, boolean isFed)
+      throws DogAgeException {
+    if (age < 0) {
+      throw new DogAgeException("Age cannot be negative.");
+    }
+    this.age = age;
+    this.breed = breed;
+    this.gender = gender;
+    this.color = color;
+    this.isFed = isFed;
+    this.favoriteToys = new ArrayList<>();
+  }
+
+  // Member functions
+  public String getDogDescription() {
+    return age > 5 ? "Senior Dog" : "Young Dog"; // Conditional expression
+  }
+
+  public void addFavoriteToy(String toy) {
+    favoriteToys.add(toy);
+  }
+
+  public List<String> getFavoriteToys() {
+    List<String> toys = new ArrayList<>();
+    for (String toy : favoriteToys) { // Loop
+      toys.add(toy);
+    }
+    return toys;
+  }
+
+  // Getters
+  public int getAge() {
+    return age;
+  }
+
+  public String getBreed() {
+    return breed;
+  }
+
+  public String getGender() {
+    return gender;
+  }
+
+  public Colors getColor() {
+    return color;
+  }
+
+  public boolean isFed() {
+    return isFed;
+  }
+}
diff --git a/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/Nile'sDog16/Dog.java b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/Nile'sDog16/Dog.java
new file mode 100644
index 000000000..7dc652366
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/Nile'sDog16/Dog.java
@@ -0,0 +1,58 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class Dog {
+  public abstract class EnumToArray {
+    enum Colors {
+      WHITE,
+      BROWN,
+      BLONDE;
+    }
+
+    //
+    public static void main(Enum[] args) {
+
+      List<Colors> colorList = new ArrayList<>();
+      for (Colors color : Colors.values()) {}
+    }
+
+    // Attributes
+    private int age;
+    private String breed;
+    private String gender;
+    private Boolean isFed, isNotFed;
+    private Colors color;
+
+    // Constructor
+    public void Dog(int age, String breed, String gender, Enum Colors, boolean isFed) {
+      this.age = age;
+      this.breed = breed;
+      this.gender = gender;
+      this.color = color;
+      this.isFed = isFed | isNotFed;
+    }
+
+    public static int myDogsAge(int Age) {
+      return 2;
+    }
+
+    public static String getbreed(String breed) {
+      return "mutt";
+    }
+
+    public static String getGender(String Gender) {
+      return "male";
+    }
+
+    public static Enum getColors(Enum Colors) {
+      return Colors;
+    }
+
+    public Boolean isFed(Boolean Fed) {
+
+      Boolean getFedStatus = isFed, isNotFed;
+
+      return getFedStatus == Fed;
+    }
+  }
+}
diff --git a/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/Nile'sDog16/com/codedifferently/com/codedifferently/Dog.java b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/Nile'sDog16/com/codedifferently/com/codedifferently/Dog.java
new file mode 100644
index 000000000..d2c3f2f5d
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/Nile'sDog16/com/codedifferently/com/codedifferently/Dog.java
@@ -0,0 +1,86 @@
+package com.codedifferently.lesson16.dog;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Dog implements DogTest {
+
+  // Custom exception
+  public static class DogAgeException extends Exception {
+
+    public DogAgeException(String message) {
+      super(message);
+    }
+  }
+
+  // Enum for dog colors
+  public enum Colors {
+    WHITE,
+    BROWN,
+    BLONDE
+  }
+
+  // Member variables
+  private int age;
+  private String breed;
+  private String gender;
+  private Colors color;
+  private boolean isFed;
+  private List<String> favoriteToys;
+
+  // Constructor
+  public Dog(int age, String breed, String gender, Colors color, boolean isFed)
+      throws DogAgeException {
+    if (age < 0) {
+      throw new DogAgeException("Age cannot be negative.");
+    }
+    this.age = age;
+    this.breed = breed;
+    this.gender = gender;
+    this.color = color;
+    this.isFed = isFed;
+    this.favoriteToys = new ArrayList<>();
+  }
+
+  // Member functions
+  public String getDogDescription() {
+    return age > 5 ? "Senior Dog" : "Young Dog"; // Conditional expression
+  }
+
+  public void addFavoriteToy(String toy) {
+    favoriteToys.add(toy);
+  }
+
+  public List<String> getFavoriteToys() {
+    List<String> toys = new ArrayList<>();
+    for (String toy : favoriteToys) { // Loop
+      toys.add(toy);
+    }
+    return toys;
+  }
+
+  // Getters
+  public int getAge() {
+    return age;
+  }
+
+  public String getBreed() {
+    return breed;
+  }
+
+  public String getGender() {
+    return gender;
+  }
+
+  public Colors getColor() {
+    return color;
+  }
+
+  public boolean isFed() {
+    return isFed;
+  }
+
+  public String getFavoriteToys() {
+    return favoriteToy;
+  }
+}
diff --git a/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/Nile'sDogTest16/DogTest.java b/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/Nile'sDogTest16/DogTest.java
new file mode 100644
index 000000000..822fb38c0
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/Nile'sDogTest16/DogTest.java
@@ -0,0 +1,105 @@
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import com.codedifferently.lesson16.Dog.Dog;
+import org.junit.jupiter.api.Test;
+
+public class DogTest {
+  public abstract class EnumToArray {
+    enum Colors {
+      WHITE,
+      BROWN,
+      BLONDE;
+    }
+  }
+
+  public int getAge(int age) {
+    return age;
+  }
+
+  @Test
+  public void testGetAge() {
+    int getAge = getAge(2);
+    int myDogsAge = getAge(2);
+    assertThat(getAge(2)).isNotNull();
+  }
+
+  public String getbreed(String breed) {
+    return breed;
+  }
+
+  @Test
+  public void testGetBreed() {
+    String getBreed = getbreed(getbreed("Mutt"));
+    assertThat(getbreed("Mutt"));
+  }
+
+  public String getGender(String gender) {
+    return gender;
+  }
+
+  @Test
+  public String testGetGender() {
+    String getGender = getGender(getGender("male"));
+
+    assertThat(getGender("male"));
+    return getbreed(getGender);
+  }
+
+  public Colors getColors(Colors Colors) {
+    return Colors;
+  }
+
+  @Test
+  public Colors testGetColors(Colors Colors) {
+    Colors testColor = Colors.BROWN;
+    assertThat(getColors(Colors));
+    return getColors(Colors);
+  }
+
+  @Test
+  public void testgetColor() {
+    assertThat(getColors(null));
+  }
+
+  @Test
+  Boolean isFed(Boolean Fed) {
+    var isNotFed = false;
+    var isFed = true;
+    var getFedStatus = Fed || isNotFed;
+    assertThat(getFedStatus).isTrue();
+    assertThat(Fed).isFalse();
+    assertThat(getFedStatus).isEqualTo(isFed);
+    return getFedStatus == Fed;
+  }
+
+  @Test
+  public void testDogConstructorThrowsExceptionForNegativeAge() {
+    // Arrange
+    Colors colorList = Colors.getBROWN();
+    int negativeAge = -1;
+    String breed = "Mutt";
+    String gender = "male";
+    boolean isFed = true;
+    Enum Color1 = null;
+
+    // Act & Assert
+    assertThatThrownBy(() -> new Dog(negativeAge, breed, gender, Color1, isFed))
+        .isInstanceOf(DogAgeException.class)
+        .hasMessage("Age cannot be negative.");
+  }
+
+  @Test
+  public String testaddFavoriteToy(String toy) {
+
+    Enum Color1 = null;
+
+    Dog dog = new Dog(2, "Mutt", "male", Color1, true);
+
+    String favoriteToy = "Squeaky Fish";
+
+    assertThat(favoriteToy).isEqualTo("Squeaky Fish");
+
+    return toy;
+  }
+}
diff --git a/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/Nile'sDogTest16/com/codedifferently/lesson_16/Dog/com/codedifferently/lesson_16/Dog/com/codedifferently/lesson16/DogTest.java b/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/Nile'sDogTest16/com/codedifferently/lesson_16/Dog/com/codedifferently/lesson_16/Dog/com/codedifferently/lesson16/DogTest.java
new file mode 100644
index 000000000..c565fd0bf
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/Nile'sDogTest16/com/codedifferently/lesson_16/Dog/com/codedifferently/lesson_16/Dog/com/codedifferently/lesson16/DogTest.java
@@ -0,0 +1,53 @@
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import org.junit.jupiter.api.Test;
+
+public class DogTest {
+
+  @Test
+  public void testGetAge() throws Dog.DogAgeException {
+    Dog dog = new Dog(2, "Mutt", "male", Dog.Colors.BROWN, true);
+    assertThat(dog.getAge()).isEqualTo(2);
+  }
+
+  @Test
+  public void testGetBreed() throws Dog.DogAgeException {
+    Dog dog = new Dog(2, "Mutt", "male", Dog.Colors.BROWN, true);
+    assertThat(dog.getBreed()).isEqualTo("Mutt");
+  }
+
+  @Test
+  public void testGetGender() throws Dog.DogAgeException {
+    Dog dog = new Dog(2, "Mutt", "male", Dog.Colors.BROWN, true);
+    assertThat(dog.getGender()).isEqualTo("male");
+  }
+
+  @Test
+  public void testGetColor() throws Dog.DogAgeException {
+    Dog dog = new Dog(2, "Mutt", "male", Dog.Colors.BROWN, true);
+    assertThat(dog.getColor()).isEqualTo(Dog.Colors.BROWN);
+  }
+
+  @Test
+  public void testIsFed() throws Dog.DogAgeException {
+    Dog dog = new Dog(2, "Mutt", "male", Dog.Colors.BROWN, true);
+    assertThat(dog.isFed()).isTrue();
+  }
+
+  @Test
+  public void testDogConstructorThrowsExceptionForNegativeAge() {
+    // Act & Assert
+    assertThatThrownBy(() -> new Dog(-1, "Mutt", "male", Dog.Colors.BROWN, true))
+        .isInstanceOf(Dog.DogAgeException.class)
+        .hasMessage("Age cannot be negative.");
+  }
+
+  @Test
+  public void testAddFavoriteToy() throws Dog.DogAgeException {
+    Dog dog = new Dog(2, "Mutt", "male", Dog.Colors.BROWN, true);
+    String favoriteToy = "Squeaky Fish";
+    dog.addFavoriteToy(favoriteToy);
+    assertThat(dog.getFavoriteToys()).contains(favoriteToy);
+  }
+}