diff --git a/src/main/java/com/cocos/cocos/api/pet/service/PetService.java b/src/main/java/com/cocos/cocos/api/pet/service/PetService.java
index 421a2ef..05651b5 100644
--- a/src/main/java/com/cocos/cocos/api/pet/service/PetService.java
+++ b/src/main/java/com/cocos/cocos/api/pet/service/PetService.java
@@ -79,8 +79,8 @@ public void addPet(final PetCreateRequest petCreateRequest, final Long memberId)
     }
 
     private void validatePetDiseases(List<Long> diseaseIds) {
-        List<Long> validDiseaseIds = petDiseaseRepository.findAllById(diseaseIds).stream()
-                .map(PetDisease::getId)
+        List<Long> validDiseaseIds = diseaseRepository.findByIdIn(diseaseIds).stream()
+                .map(Disease::getId)
                 .toList();
 
         List<Long> invalidDiseaseIds = diseaseIds.stream()
@@ -93,8 +93,8 @@ private void validatePetDiseases(List<Long> diseaseIds) {
     }
 
     private void validatePetSymptoms(List<Long> symptomIds) {
-        List<Long> validSymptomIds = petSymptomRepository.findAllById(symptomIds).stream()
-                .map(PetSymptom::getId)
+        List<Long> validSymptomIds = symptomRepository.findByIdIn(symptomIds).stream()
+                .map(Symptom::getId)
                 .toList();
 
         List<Long> invalidSymptomIds = symptomIds.stream()
@@ -128,8 +128,10 @@ public void updatePet(final PetUpdateRequest petUpdateRequest, final Long petId,
         if (!pet.getMemberId().equals(memberId)) {
             throw new CocosException(FailMessage.FORBIDDEN_PET_UPDATE);
         }
-        if (!breedRepository.existsById(petUpdateRequest.breedId())) {
-            throw new CocosException(FailMessage.NOT_FOUND_BREED);
+        if (petUpdateRequest.breedId() != null) {
+            if (!breedRepository.existsById(petUpdateRequest.breedId())) {
+                throw new CocosException(FailMessage.NOT_FOUND_BREED);
+            }
         }
         pet.updateFields(petUpdateRequest.name(), petUpdateRequest.gender(), petUpdateRequest.age(), petUpdateRequest.breedId());
 
diff --git a/src/main/java/com/cocos/cocos/db/disease/repository/DiseaseRepository.java b/src/main/java/com/cocos/cocos/db/disease/repository/DiseaseRepository.java
index 2972450..7c5aab8 100644
--- a/src/main/java/com/cocos/cocos/db/disease/repository/DiseaseRepository.java
+++ b/src/main/java/com/cocos/cocos/db/disease/repository/DiseaseRepository.java
@@ -10,4 +10,5 @@
 public interface DiseaseRepository extends JpaRepository<Disease, Long> {
 
     List<Disease> findAllByBodyId(final Long bodyId);
+    List<Disease> findByIdIn(final List<Long> ids);
 }
diff --git a/src/main/java/com/cocos/cocos/db/symptom/repository/SymptomRepository.java b/src/main/java/com/cocos/cocos/db/symptom/repository/SymptomRepository.java
index aab4ebc..65da91f 100644
--- a/src/main/java/com/cocos/cocos/db/symptom/repository/SymptomRepository.java
+++ b/src/main/java/com/cocos/cocos/db/symptom/repository/SymptomRepository.java
@@ -10,4 +10,5 @@
 public interface SymptomRepository extends JpaRepository<Symptom, Long> {
 
     List<Symptom> findAllByBodyId(final Long BodyId);
+    List<Symptom> findByIdIn(final List<Long> ids);
 }