My buddy motored one just like it. I hope you have reinforced the front fender. his came loose...got tangled enough to lock up his front wheel........sent him over the handlebars....he said he was in the air....(like superman) ....long enough to contemplate his landing. fortunately, he was ok.(to hear him tell it, was a hoot!) there have been several other instances of this happening... on the cranbrook.... some were not so lucky. just want ya to ride safe.
Yes, the fenders are made from very thin steel which cracks easily, especially the top support on the front fender. When the fender ends up between your tire and the road it will cause a wreck. If you must have fenders, add supports and inspect them every time you ride. Or get some soft plastic fenders that flex instead of break.
Mine is the Moon dog. Are you saying that they come loose or completely break off?