diff --git a/src/animalposer.cpp b/src/animalposer.cpp
index 6e924871..68fae8be 100644
--- a/src/animalposer.cpp
+++ b/src/animalposer.cpp
@@ -20,13 +20,13 @@ void AnimalPoser::resolveTransform()
         resolveChainRotation(chain.second);
     }
     
-    int firstSpineBoneIndex = findBoneIndex(Rigger::firstSpineBoneName);
-    if (-1 == firstSpineBoneIndex) {
-        qDebug() << "Find first spine bone failed:" << Rigger::firstSpineBoneName;
-        return;
-    }
+    //int firstSpineBoneIndex = findBoneIndex(Rigger::firstSpineBoneName);
+    //if (-1 == firstSpineBoneIndex) {
+    //    qDebug() << "Find first spine bone failed:" << Rigger::firstSpineBoneName;
+    //    return;
+    //}
     
-    const auto &firstSpineBone = bones()[firstSpineBoneIndex];
+    //const auto &firstSpineBone = bones()[firstSpineBoneIndex];
     
     float mostBottomYBeforeTransform = std::numeric_limits<float>::max();
     for (const auto &bone: bones()) {
@@ -38,15 +38,15 @@ void AnimalPoser::resolveTransform()
     auto transformedJointNodeTree = m_jointNodeTree;
     transformedJointNodeTree.recalculateTransformMatrices();
     float mostBottomYAfterTransform = std::numeric_limits<float>::max();
-    QVector3D firstSpineBonePositionAfterTransform = firstSpineBone.headPosition;
+    //QVector3D firstSpineBonePositionAfterTransform = firstSpineBone.headPosition;
     for (int i = 0; i < (int)transformedJointNodeTree.nodes().size(); ++i) {
         const auto &bone = bones()[i];
         const auto &jointNode = transformedJointNodeTree.nodes()[i];
         QVector3D newPosition = jointNode.transformMatrix * bone.tailPosition;
-        if (0 == i) {
+        //if (0 == i) {
             // Root bone's tail position is the first spine bone's head position
-            firstSpineBonePositionAfterTransform = newPosition;
-        }
+        //    firstSpineBonePositionAfterTransform = newPosition;
+        //}
         if (newPosition.y() < mostBottomYAfterTransform)
             mostBottomYAfterTransform = newPosition.y();
     }
diff --git a/src/animalrigger.cpp b/src/animalrigger.cpp
index c8542c2c..ab3d6590 100644
--- a/src/animalrigger.cpp
+++ b/src/animalrigger.cpp
@@ -219,6 +219,7 @@ bool AnimalRigger::rig()
     auto tailIndices = m_marksMap.find(std::make_pair(BoneMark::Tail, SkeletonSide::None));
     auto leftLimbIndices = m_marksMap.find(std::make_pair(BoneMark::Limb, SkeletonSide::Left));
     auto rightLimbIndices = m_marksMap.find(std::make_pair(BoneMark::Limb, SkeletonSide::Right));
+    bool hasTail = false;
     std::vector<int> nosideMarkIndices;
     std::vector<int> leftMarkIndices;
     std::vector<int> righMarkIndices;
@@ -229,6 +230,7 @@ bool AnimalRigger::rig()
     if (tailIndices != m_marksMap.end()) {
         for (const auto &index: tailIndices->second)
             nosideMarkIndices.push_back(index);
+        hasTail = true;
     }
     if (leftLimbIndices != m_marksMap.end()) {
         for (const auto &index: leftLimbIndices->second)
@@ -421,7 +423,7 @@ bool AnimalRigger::rig()
             spineBoneHeadPosition.setY(averagePoint.y());
         }
         
-        QString spineName = namingSpine(spineGenerateOrder);
+        QString spineName = namingSpine(spineGenerateOrder, hasTail);
         
         m_resultBones.push_back(RiggerBone());
         RiggerBone &spineBone = m_resultBones.back();
@@ -439,8 +441,8 @@ bool AnimalRigger::rig()
             m_resultBones[boneIndexMap[Rigger::rootBoneName]].tailPosition = spineBone.headPosition;
             m_resultBones[boneIndexMap[Rigger::rootBoneName]].children.push_back(spineBone.index);
         } else {
-            m_resultBones[boneIndexMap[namingSpine(spineGenerateOrder - 1)]].tailPosition = spineBone.headPosition;
-            m_resultBones[boneIndexMap[namingSpine(spineGenerateOrder - 1)]].children.push_back(spineBone.index);
+            m_resultBones[boneIndexMap[namingSpine(spineGenerateOrder - 1, hasTail)]].tailPosition = spineBone.headPosition;
+            m_resultBones[boneIndexMap[namingSpine(spineGenerateOrder - 1, hasTail)]].children.push_back(spineBone.index);
         }
         
         for (const auto &chainMarkIndex: spineNode.chainMarkIndices) {
@@ -460,7 +462,7 @@ bool AnimalRigger::rig()
             if (1 == spineGenerateOrder) {
                 m_resultBones[boneIndexMap[Rigger::rootBoneName]].children.push_back(ribBone.index);
             } else {
-                m_resultBones[boneIndexMap[namingSpine(spineGenerateOrder)]].children.push_back(ribBone.index);
+                m_resultBones[boneIndexMap[namingSpine(spineGenerateOrder, hasTail)]].children.push_back(ribBone.index);
             }
             
             std::vector<int> jointMarkIndices;
@@ -619,10 +621,14 @@ QString AnimalRigger::namingChain(const QString &baseName, SkeletonSide side, in
     return namingChainPrefix(baseName, side, orderInSide, totalInSide) + "_Joint" + QString::number(jointOrder);
 }
 
-QString AnimalRigger::namingSpine(int spineOrder)
+QString AnimalRigger::namingSpine(int spineOrder, bool hasTail)
 {
-    if (1 == spineOrder)
-        return Rigger::firstSpineBoneName;
+    if (hasTail) {
+        if (spineOrder <= 2) {
+            return "Spine0" + QString::number(spineOrder);
+        }
+        spineOrder -= 2;
+    }
     return "Spine" + QString::number(spineOrder);
 }
 
diff --git a/src/animalrigger.h b/src/animalrigger.h
index d0ca8c39..72fd786f 100644
--- a/src/animalrigger.h
+++ b/src/animalrigger.h
@@ -19,7 +19,7 @@ protected:
     BoneMark translateBoneMark(BoneMark boneMark) override;
 private:
     bool collectJontsForChain(int markIndex, std::vector<int> &jointMarkIndices);
-    static QString namingSpine(int spineOrder);
+    static QString namingSpine(int spineOrder, bool hasTail);
     static QString namingConnector(const QString &spineName, const QString &chainName);
     static QString namingChain(const QString &baseName, SkeletonSide side, int orderInSide, int totalInSide, int jointOrder);
     static QString namingChainPrefix(const QString &baseName, SkeletonSide side, int orderInSide, int totalInSide);
diff --git a/src/posedocument.cpp b/src/posedocument.cpp
index 0da0b167..79b6955a 100644
--- a/src/posedocument.cpp
+++ b/src/posedocument.cpp
@@ -514,13 +514,14 @@ float PoseDocument::findFootBottomY() const
     return maxY;
 }
 
-float PoseDocument::findLegHeight() const
-{
-    float firstSpineY = findFirstSpineY();
-    float footBottomY = findFootBottomY();
-    return std::abs(footBottomY - firstSpineY);
-}
+//float PoseDocument::findLegHeight() const
+//{
+//    float firstSpineY = findFirstSpineY();
+//    float footBottomY = findFootBottomY();
+//    return std::abs(footBottomY - firstSpineY);
+//}
 
+/*
 float PoseDocument::findFirstSpineY() const
 {
     const auto &findFirstSpine = m_boneNameToIdsMap.find(Rigger::firstSpineBoneName);
@@ -535,6 +536,7 @@ float PoseDocument::findFirstSpineY() const
     }
     return firstSpineNode->y;
 }
+*/
 
 void PoseDocument::toParameters(std::map<QString, std::map<QString, QString>> &parameters, const std::set<QUuid> &limitNodeIds) const
 {
diff --git a/src/posedocument.h b/src/posedocument.h
index a66413e8..e77dc30c 100644
--- a/src/posedocument.h
+++ b/src/posedocument.h
@@ -61,8 +61,8 @@ public:
 private:
     QString findBoneNameByNodeId(const QUuid &nodeId);
     float findFootBottomY() const;
-    float findFirstSpineY() const;
-    float findLegHeight() const;
+    //float findFirstSpineY() const;
+    //float findLegHeight() const;
     void parametersToNodes(const std::vector<RiggerBone> *rigBones,
         const float heightAboveGroundLevel,
         std::map<QString, std::pair<QUuid, QUuid>> *boneNameToIdsMap,
diff --git a/src/rigger.cpp b/src/rigger.cpp
index 5e420aba..bf8f3f5a 100644
--- a/src/rigger.cpp
+++ b/src/rigger.cpp
@@ -7,7 +7,7 @@
 
 size_t Rigger::m_maxCutOffSplitterExpandRound = 3;
 QString Rigger::rootBoneName = "Body";
-QString Rigger::firstSpineBoneName = "Spine1";
+//QString Rigger::firstSpineBoneName = "Spine1";
 
 Rigger::Rigger(const std::vector<QVector3D> &verticesPositions,
         const std::set<MeshSplitterTriangle> &inputTriangles) :
diff --git a/src/rigger.h b/src/rigger.h
index eea49fb8..9885f498 100644
--- a/src/rigger.h
+++ b/src/rigger.h
@@ -130,7 +130,7 @@ public:
     const std::map<int, RiggerVertexWeights> &resultWeights();
     virtual bool rig() = 0;
     static QString rootBoneName;
-    static QString firstSpineBoneName;
+    //static QString firstSpineBoneName;
 protected:
     virtual bool validate() = 0;
     virtual bool isCutOffSplitter(BoneMark boneMark) = 0;