I have read that many times, but I have not seen an explanation as to why. I'm sure its out there, I have just not come across it yet.. I can assume it is because of some reaction, but what is the Pathology behind it? What makes it hard so hard for the little guys? And last but not least what are the options for someone wanting to exclude this, is there a Sub?   
I think this would be good info for anyone with a young pup!     
				__________________  Kathryn, Pixie    and Chynna         |