Have you bought a dog for autistic child?

After lots and lots of research we decided last weekend to go choose a puppy for our son. We took him with us and thoroughly enjoyed playing with the mum dog. We collect puppy in a few weeks. Since telling people we are getting a therm we've had some really negative feedback and people saying we are taking on too much. I know a puppy will be hard work but there are many reasons why we are getting one for my son. People's comments have hurt me. We are getting a golden retriever cross labrador as that's what had bed. Recommended to you'd by several parties. Have you bought a body for your autistic child? If so how has it benefitted them?