Having dealt with this in a previous litter, and finding very little useful information about it, I am trying to gather more info about Puppy strangles, also called Juvenile Cellulitis. If you have had a litter affected by this, please visit the following URL and copy and paste the survey into an email message. Other instructions are on the survey form. Please feel free to crosspost.
The survey can be found at http://www.tarkom.com/PuppyStranglesSurvey.htm
