replaced Override method with constructor

src/main/java/com/pfefferminzia/petinsurance/animals/Dog.java

@@ -4,6 +4,10 @@ import java.time.LocalDate;
 
 public final record Dog(LocalDate birthday, String breed) implements Animal {
 
+    public Dog {
+        breed = (breed == null || breed.isBlank()) ? "" : breed;
+    }
+
     @Override
     public String speciesKey() {
         return "DOG";