I have three English Pointers who are totally mental, the breeder of Belle after sending her photos thought it may have been the result of a side shunt from one of the others. After 2 weeks I'm not now convinced.
Belle has not had any blood work done in the last few months but she was spayed late July.
Our Tilly was not related to Belle and sadly had to be put to sleep after we were unable to control the symptoms and the pain of Masticatory Muscle Myositis
No. But if we turn her head to the left she appears normal. If we turn her head to the right the bulge is more evident.
I had Belle booked in at the vets for an x-ray and bloods on friday, vet cancelled on the day as he discovered on examination that Belle had a high temperature and a bad throat infection, around the tonsils, he would not anaesthetize her!
Now on antibiotics for a week. I'm to give him an update on monday, if we have some improvement then he will do x-ray and bloods on coming friday.
Thanks to some research from the breeder we have since discovered that our Belles mother, Maisie, also had a slightly lopsided rib cage, only really noticable when underweight, as is the case with our Belle..... although the other dogs in the same litter as Belle are all normal
You may have been correct in your diagnosis that it could be "congenital".