He was supposed to be vet checked and healthy when we got him (which obviously wasn't the case
To tell the truth, it's entirely possible that he presented with no murmur and sounded perfectly healthy during the Vet check. It sometimes depends on when the Vet check was done. If it was done before 8 weeks, the murmur might not have been heard, as they appear after 8 weeks of age. In fact, it could have been done later than that, and never heard.
SAS is tricky and misunderstood by many people. Even a cardiologist can clear a dog at the ages of eight weeks to a year, via ascultation, and the dog can end up with a SAS murmur at a later age (3, 4, 5 or older). This is why it's recommended by the AKC (via the parent breed clubs) that ALL breeds with the potential for the heritibility of SAS or other heart problems have a heart check every two years. A Heart clearance is only good on the date it's done. It's subject to change.
A cleared dog may not be clear at all. The only way to determine if a puppy/dog is truly clear is to have a Doppler done, but the expense is great, so ascultation is the preferred method, unless there's a problem.
Mild SAS can go undetected for years. The murmur, although there, is so soft, that it can be and is, too frequently missed. It's definitely a shock to the owners when a dog who has been "clear" for ages, suddenly presents with an obviously loud murmer, and it's SAS! Or, when a puppy (like yours) has SAS and the parents don't.
It's really a mess when litters have been born to that dog or bitch, who presents with SAS at a later age.
Prior to that, the breeder may have had no way of knowing if it hadn't obviously presented in the dog's line. It could have been there, but never known ... because the dogs in the line that actually were affected with SAS died early from other causes (such as an accident, infection, etc.), or the deaths were misdiagnosed.
Most importantly, the sire and dam of the litter might well be 100% clear of murmurs for life, never affected at all. But they would have to both be carriers, if they're parents of a SAS puppy.
There's absolutely no way to know who's a carrier, until the unthinkable happens. That's why the sooner there's a DNA test for SAS, the better. Then there wouldn't be matings of two carrier dogs without knowledge. Affected dogs would be diagnosed early. Clear dogs would be absolute.
Yes, I know of dogs with moderate murmurs who live a long time...many years, in fact. But, no doctor will guarantee that. They just can't predict what will happen.
Keep that hope alive. And enjoy your boy every day. He doesn't know he's sick, so do your very best to not make him an invalid. I wish him the very best, LONG life!!
[ 02-24-2006, 01:31 AM: Message edited by: Ardeagold ]