Carol, I suspect it may have something to do with Canine Parvo Virus. I worked in a pet store many years ago and it is an awful disease, highly contagious. Most of the puppies we treated failed to survive. All dogs can get it, but it is most prevalent and dangerous in young puppies. I can't say that's the reason but bet it has something to do with the regulation.
[color:"red"]FRAN[/color] "Yes I am a pirate, 200 years too late"