I asked a similar question here Part of mesh goes outside but the solution for merging the faces doesn't work on this model. The model is here:
The right leg of the turtle gets distached from the main body of the turtle. I tried joining the faces of the turtle like the recommendation in the earlier question I posted the link to, but I get the error message of "could not create merged face". So I need to find what's causing this.
Also on another note, the left leg while it doesn't get detached from the mesh, it still gets deformed in not a nice way.
Thank you in advance! :)