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Thread: Patent Ductus Arteriosus

  1. #1

    Default Patent Ductus Arteriosus

    I am a Cavalier breeder. I have had a litter by a (heart tested) dog and (also heart tested girl). There were 4 healthy pups. One had a murmur, which on examination by a cardiac specialist proved to be PDA (as above).

    The concerning thing is that the specialist suggested that there is believed to be an hereditary component to PDA. He was not very forthcoming, saying there were no % nor any studies done.

    The dog has sired a few litters. None with any problems. This is the girl's second litter. She is heart checked regularly by a specialist. Her father ditto - his parents died heart clear in their teens Her mother died at 3 - nothing to do with heart, and the rest of her line was heart clear into old age.

    None owned by me had PDA.

    I am posting on the off chance that another breeder may have had this or knows something about it? I have previously been told by vets that things are hereditary and then it has been discovered years later that they aren't.

    I will not repeat the mating, but I would like to breed from the mother again, because of her health status and other factors, and I am hoping to find out whether any breeder or owner has any first hand experience which they can share with me. I certainly don't want to breed pups with heart problems.

    Thanks in advance.

  2. #2
    Join Date
    Jun 2011
    Llandrindod Wells


    I spent many years nagging Mr Swift to include All murmurs on the CKCS Club heart form. PDA's and stenosis's do appear in this breed but the extent is unknown as there hasn't been adequate data gathered.
    I would suggest you speak to a cardiologist there's a list on the BVA website.
    Certainly in breeds such as Boxers PDA's do have an inherited factor
    Bridgette Evans
    Svena CKCS

  3. #3
    Join Date
    Jun 2015
    Benoni, 32km east of Johannesburg, Tvl, South Africa


    A fellow breeder here in South Africa had a case a couple of years ago which "appeared out of the blue" and funnily enough within months a Dalmatian puppy was also diagnosed. The Dalmatian's breeder was referred to the same specialist who successfully operated on the Cavalier. His opinion was that it is a random congenital defect (congenital being there at birth) as opposed to genetic (hereditary). He felt that it could occur with a premature puppy - maybe one which resulted from a later mating than its litter siblings - since under normal circumstances the ductus arteriosus closes within a day of birth, alternately the dam may have had some sort of infection during pregnancy. As far as we are aware no other puppies in either litter were affected, the Cavalier was one of five and all were still with the breeder so she was certain, whilst the Dalmatians had already gone to their new homes, I think she was one of nine, but no one else has complained about a problem. I was very relieved since both Dalmatian parents were bred by myself, hence the interest I have taken.

    Interestingly, both puppies affected were bitches and I have been told that in humans far more girls than boys are affected. The human cardio who told me this also said that if it were genetic in a human he would expect there to be other heart defects as well and supposed that the same would apply to animals. He said that if a lady who had had it wanted to have a baby she would need to be very closely monitored for her own health's sake even though she had been surgically healed, so if your affected puppy is a bitch it might be wiser that she is not bred from, from that point of view alone.

  4. #4


    Having bred both Boxers and Cavaliers I can confidently agree with my vet cardiologist - that it's a congenital condition, resolving in most cases, and strangely, often associated with my individuals who do not go on to have MVD or AS as adults.
    My MVD clear 10 year old had a litter of 3 ...all late closure...ALL still MVD clear rising 8.

  5. #5


    Thank you all very much for your responses. The vet was a cardiologist. The puppy is a girl. Saw the Cardiologist at 9 months. She is being scanned in a month to see how bad it is.

    It is heartening to hear that breeders believe that it is a congenital condition. My research suggested that and it is congenital rather than hereditary.

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