Bone Cancer In Dogs

well, we lost our beloved golden retriever to bone marrow cancer about a month ago. we know its too soon to be looking for a new dog, but me and my dad miss having a dog to sit around with and play with. we would never “replace” him, but we are looking at dogs, but not to buy at this moment. my dad likes pure bred dogs, preferably the vizsla. i absolutely love vizlas, but he says they are too expensive to buy. and usually, the younger they are, the most expensive they are. yet, he wants a puppy. hes really confusing. but for quite a number of years, ive wanted to adopt/rescue a dog. it makes me incredibly sad to see dogs that have been through so much, and need a loving home, yet they get euthanized because of space shortages in shelters. i would do anything to be able to help out a dog in need. and most adoption fees are $50 to $100 where i live. and i found a dog with an amazing story, but my dad doesnt like the fact that he is mixed between a vizsla and a labrador. the dog was beaten and abandoned at just 4 months of age, and he weighs just 25 lbs. my sister on the other hand doesnt want to adopt either because the dog cowers due to being beaten and id hate to see a sweet, innocent dog like him get euthanized. even if i just adopt one dog, its making a difference.. what can i do to show them that rescuing a dog is so much better?
sorry, ive failed to mention that the vizsla dog im looking in to, is a sort of rare breed where i live. ive looked everywhere for a pure bred vizsla puppy, and i cant seem to find one.
also, i feel that my home is the right home too. whatever we get, everyone will be happy with or we wouldnt havent got the dog at all. we treat animals like people in my home. with love and respect. animals deserve a second chance at life too, after all, many people have gotten second chances, so do animals..