My Tina was repeatedly diagnosed for too slow pulse for many years!!! At least 4 vets independantly suggested at various times of her life that she had poor heart though she had enormous amount of energy and could EASILY run 10-12 km by the bike even at the age of 12. Thanks God once we came across a vet who told us, that a wolfdog might have a 'sports heart' that beats at normal speed only when the animal makes efforts, while it beats relatively slowly when the dog rests. Probably this is not the case of all CSVs but might happen.
You should check it, of course, but don't panic too soon, just observe your dog carefully before you make any final judgements. My recent experiences show that vets sometimes underestimate the wolfishness of wolfdogs. They DO differ a bit from other dogs as far as physiology is concerned
