This is where the saying, "How long is a piece of string" comes into play!! If the parents are not huge, he is probably just growth spurting, but will eventually start to get into proportion.
Bentley is all legs and ears and has been all along. Everyone comments on how leggy he is, but he is gradually filling out a bit and is now 9 months old. He is looking less like a Great Dane in a Ginger suit these days thankfully.
This is all part of a puppies charm, so make the most of it and I am sure he will grow into a stunning Vizsla, as they all do!