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Hi. Welcome to Just Answer. My name is***** Thank you for your question. I'm very glad to hear that you're doing your research on getting this new addition to the house! In all honesty, the hereditary component of the cancers are not absolute as far as the predominance of there appearing in future generations. How likely is a chance of the hemangiosarcoma or liver tumor showing up in this puppy? More than likely they wouldn't be that worrisome as to require you to look elsewhere for a new family member. If you were to look in the lineage of pretty much any family tree of golden's you'll find the random spattering of those cancers along with lymphoma too. It sounds like this breeder has kept very good records to have this history to give to you. When a breeder shows that much responsibility, that definitely impresses me. As far as requesting history on other puppies, you can always ask and see what the breeder provides. The more information they can give, that again typically indicates that they are doing their best to put out as good of a quality of puppy as possible.
How far back to look? You could try and look back as far as possible to see what it reveals. 3 or 4 back seems to be pretty good to have an overall idea as to what has been there in the past. Again with cancers, they can sometimes come out of no where with some. As to which ones have less cancer, that seems to vary. I can't say that I find one versus the other having less or more. I'm sorry to hear about your recent loss of the 13.5 year old. To be honest, that is getting very old for a golden. At my ER, I'm unfortunately seeing many that aren't even 10 having lymphoma and hemangiosarcomas. The golden's are a great breed, but they do seem to have more cancer issues.