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I was more thinking along the lines of preventative measures for things like bad joints. If we knew she was genetically predisposed to something like that and we were able to take steps early on to reduce the risk of an issue later in life it would be worth doing! As mentioned though, the fact that she's a mix of all sorts probably does mean that firstly, any test we did get might not be all that useful and secondly, she'll hopefully be less prone to any issues caused by inbreeding etc.
Personally I don't care about her genetic makeup beyond wanting to be aware of any health issues to keep an eye on! She could turn out to be 10% rat and I wouldn't be upset or surprised.
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Most health issues have been, mostly accidentally, bred into pure bred dogs. Your bitsa dog will no doubt live a long and healthy life. My Sprollie is 15+ now and I've saved £3k by not insuring him for the last two years. The majority of his vets bills have been self inflicted claw and joint injuries chasing foxes out of the garden because he's a knob.🙂
Why not just enjoy your time together. It's not some kind of canine Logan's Run just sit back pay your pet insurance and deal with the problems as they arise. Being a Heinz 57 Crumpet is probably as fit as they come.