I am very sorry about Brandy. She was a really good mother. Thanks for telling about the overbite. I never saw an overbite on a cow or a bison here in Montana. Overbite seems to be more common in eastern states - type Dork Deer Images on Google and lots of photos will come up. For some reason, people who kill or see deer with an overbite call them Dork Deer. Personally, I am not so sure the deer are the Dorks.
We did have a male white-tailed deer here on our land that had an overbite - see photo. The overbite prevalence on 292 Montana hunter-killed male WTD examined by a biologist friend between 2006 and 2021 averaged 14%, but the underbite prevalence was almost twice as high at 27%. There were 59% with a normal bite. Any birth defect at over 5% is supposed to raise a red flag, but for some reason, here in western states, no one cares that the wildlife or the domestic animals are born with obvious birth defects.
I attached a photo of the buck deer with an overbite (the overbite is very obvious, right?) that lived here in our area, until a blood vessel burst in his lung cavity and he drown in his own blood at 4 years old. We found his carcass on the neighbor's land a few feet off of our land. There was no trauma of any kind on his body, but the thoracic cavity where the heart and lungs are was filled with blood. He also had an enlarged right heart ventricle. He was kind of a friendly little buck, so I was really sad when he died. Besides quite a few wild ungulates that had a blood vessel break suddenly so they drown in the blood in their thoracic cavity between 2000 and 2018, I necropsied quite a few domestic animals that neighbors brought to me to necropsy that died for the same reason. I never saw anything like that until around 2000. Apparently, something was making the blood vessels thin in that area, so they would suddenly rupture. The only good thing about this is they don't take long to die and don't appear to suffer.
I almost observed it happen to an elk calf that I was rehabbing with a skinned leg from barbwire. I checked to see if she had green foliage to eat and she was nearly out so I went out into the field and cut an arm load. She looked fine and was lying down chewing her cud. Getting the fresh grass and alfalfa only took about 10 minutes, if that long. When I got back to her, she was dead and looked like she had been dead for several minutes. She had drown in blood because of a ruptured blood vessel, just like the buck deer did.
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