I knew someone who had a goldendoodle. It cost him £2000 and died at 8 with heart issues that were hereditary. It was from a byb and both of its parents weren't health tested. It turns out it's father (the golden) had lab in him somewhere, which means their stud was also dogshit.
Meanwhile my st bernard from a great breeder with health tested parents is 10 and still going strong. She's a bit fragile but no arthritis as of yet.
Get your dogs from breeders bros, including mutts and crosses. Bybs arent worth your time and money.