The American Cavalier King Charles Spaniel Club's website reports that less than 0.002% of Cavaliers have syringomyelia. How does ACKCSC square this figure (only two SM-affected Cavaliers among every 100,000) with the reports from the CM/SM researchers, which was between 42% and 74,5%? Here is what Dr. Clare Rusbridge writes at http://www.veterinary-neurologist.co.uk/part2.htm#16 of her website:
"All scientific papers looking at groups of 16 or more asymptomatic Cavaliers have found a high incidence of syringomyelia ranging from 26.5% (Cerda-Gonzalez et al 2009 – 49 dogs) to 65.4% (Rusbridge et al 2007 – 55 dogs). These figures increased to 42% and 74.5% respectively when symptomatic dogs were added to the population."
Here is what ACKCSC states on its website at http://ackcsc.org/health/sm.html :
"This condition [SM] is known to affect less than 0.002 % of Cavalier King Charles Spaniels so you have a very good chance that your Cavalier will not have this condition."