added solution with tariff options as enum and map

src/main/java/com/pfefferminzia/petinsurance/tariffs/BreedPremiumAdjustment.java

@@ -0,0 +1,18 @@
+package com.pfefferminzia.petinsurance.tariffs;
+
+import java.math.BigDecimal;
+import java.util.Map;
+
+public final class BreedPremiumAdjustment {
+    
+    private static final Map<String, BigDecimal> ADJUSTMENTS = Map.of(
+        "Dackel", new BigDecimal("-0.1"),
+        "Bernhardiner", new BigDecimal("0.1")
+    );
+
+    public static BigDecimal forBreed(String breed) {
+        return ADJUSTMENTS.getOrDefault(breed, BigDecimal.ZERO);
+    }
+
+    private BreedPremiumAdjustment() {}
+}