The answer is no. Dog and fox are both from the Candid species and chromosomally different to co-mix for offspring. Dogs have 78 chromosomes, but red foxes have only 38 chromosomes so they can't be a match.
I'm pretty sure that they can but its rare
They sure can. Got a 8 month old foxier. Its half yorkshire terrier and half fox. Got it from a farm near me. A fox got into the kennel when the little bitch was in heat.
I am a fox, my dad is a dog. My mum is a rabbit. I live quite happily without any form of rabies, herpies or any other disease.