Hi we have a 10 week old bernese mountain dog. shes got lots of rubber toys to chew on, a kong that we fill and an activity ball that she has to roll to get treats out of, but we want something like a treat or bone she can chew or eat. How old does she have to be to be able to chew on bones? and what type should we give? also what about rawhide chewies and pigs ears? We are in the uk so any brands you know of here could you suggest. Thanks.