Before you rush in to any decisions, its worth you getting some professional advice particularly as a murmer does not need to mean anything problematic. For instance :
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[ from Hearty Dog ]
Congenital Heart Diseases
Congenital defects are those that have been present since birth. Thankfully, they are comparatively rare, accounting for only 5% of the cases seen by vets.
Congenital defects will usually cause the blood flow through the heart to become turbulent; making a distinctive whooshing noise that vets can hear using a stethoscope. That's what is meant by a 'heart murmur'. However, if your vet tells you they've detected a heart murmur in your dog, it's not necessarily cause for concern.
Many puppies are born with a slight heart murmur (or puppy murmur) that clears up by itself after 4-6 months. In many cases, vets will simply recommend a later checkup, just to be sure that the condition has resolved itself.
Pronounced heart murmur is quite rare, but may be indicative of a serious congenital defect. However, without specialist experience and equipment, it can be difficult for a GP vet to know what defect is causing the murmur. For this reason, if the murmur is pronounced, or persists beyond puppyhood, patients will often be referred to a specialist cardiologist.
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The site the above piece is from has a cardiology specialist with a phone number to contact him, so there is nothing to lose by calling to see what advice might be available :
Mike Martin MVB DVC MRCVS
RCVS Recognised Specialist
Martin Referrals
Veterinary Cardiorespiratory Centre
43 Waverley Road
Kenilworth
Warwickshire
CV8 1JL
Telephone: 01926 863445
Fax: 01926 863446
Has the breeder said if this pups murmer is congenital or not ?
If it is, they will presumably do the right thing and no longer breed from the line concerned ?
If you dont have this pup, has the breeder said what will happen to him ?
With regards to a girly with two boys, no one can say if it would be problematic or not as there are so many factors. Are the boys well soccialised ?
Are they usually good around other girls anyway ?
Are they entire or snipped ?
Would the girly be spayed ?
What will her character be as she grows ? Of course, there is no way to answer that in advance, any more than it could be predicted what personality the boy will have. Socialisation and experiences are what shape a dogs temperament far more than its genes no matter what any breeder may claim.
Some people say never have two girls together, yet countless pairs of bitches have lived perfectly happily together. Mine do, and my previous pairing of girls [ my Gremlin being in the previous pairing as well as currently ], were terrific together as well. It doesnt mean they all can be perfectly happy, any more than two boys always work, or one of each, but it sheer numbers prove that multiple dogs certainly can be great together, whatever the gender combination.
Might two or more boys squabble with a girl introduced to the family unit ?
Sometimes yes, sometimes no.
Might three boys be too much for each other ?
Sometimes yes, sometimes no.
Smply put, there is no yes or no answer - anyone claiming there is has blinkers on
I have two girls and three boys, all snipped and spayed, so they have none of the stresses that entire dogs have, but they were not all done when I first got them. The ops certainly made a hugely beneficial difference to them as a group because of the removal of unecessary stressy hormonal activity.
So, I`m afraid no matter what advice you may get on gender groupings, nothing it written in stone about it, so you have to rely on your instincts and how well you can realistically assess what your boys potential reactions may be, whether bringing in the little boy you had planned on, or a girly.
First things first, I would ask for a copy of the actual murmer diagnosis and check in to the possible ramifications of that [ especially as it doent necessarilly mean a long term issue ], because if nothing else, you were planning on having this boy as a part of your family and, though it may not have hit you yet, you may need to take time to sort through your feelings about perhaps not having him after all, before you will know for sure which path to take