Ponies no longer have to be fully submerged to become seaponies

src/main/java/com/minelittlepony/pony/data/IPony.java

@@ -46,6 +46,11 @@ public interface IPony {
      */
     boolean isFullySubmerged(EntityLivingBase entity);
 
+    /**
+     * Returns true if the provided entity is partially submerged. That is if any part of it is in contact with water.
+     */
+    boolean isPartiallySubmerged(EntityLivingBase entity);
+
     /**
      * Returns true if an entity is wearing any headgear. This is used to hide things like the snout when wearing items
      * such as the pumpkin, a player's head, or any other types of blocks.

src/main/java/com/minelittlepony/pony/data/Pony.java

@@ -124,6 +124,12 @@ public class Pony implements IPony {
         return isFullySubmerged(entity) && !(entity.onGround || entity.isOnLadder());
     }
 
+    @Override
+    public boolean isPartiallySubmerged(EntityLivingBase entity) {
+        return entity.isInWater()
+                || entity.getEntityWorld().getBlockState(new BlockPos(entity.posX, entity.posY, entity.posZ)).getMaterial() == Material.WATER;
+    }
+
     @Override
     public boolean isFullySubmerged(EntityLivingBase entity) {
         return entity.isInWater()

src/main/java/com/minelittlepony/render/player/RenderSeaponyPlayer.java

@@ -22,7 +22,7 @@ public class RenderSeaponyPlayer extends RenderPonyPlayer {
     public IPony getEntityPony(AbstractClientPlayer player) {
         IPony pony = super.getEntityPony(player);
 
-        boolean wet = pony.isFullySubmerged(player);
+        boolean wet = pony.isPartiallySubmerged(player);
 
         mainModel = renderPony.setPonyModel(wet ? seapony : normalPony);