Welcome to BYC. Glad you decided to join our flock. I'm sorry for the loss of your Wyandotte. It's always sad to lose one of our flock. I hope someone on the BLRW link that you posted on can help you replace him. Please feel free to ask any questions you may have. We are here to help in any way we can. Good luck in getting another BLRW rooster.
One you have 20 posts you can participate in the BYC Buy,sell, trade forum. There is also a "wanted to buy," section. As a rule more people advertise roosters than hens. I do hope you will be able to get a suitable replacement and no more dog attacks.