Brian I am so sorry to hear this news. Like so many of us I know how hard it is for you and your family right now. There are a number of lovely poems of remembrance rhat have been posted here over the years. I can't read the one RWTF referenced with tearing up at the memories of the three Llwellins that are no longer with me except in my memories. I hope you can find some comfort in one of them and when you read them over the coming years be reminded of the joy your Springer brought you.
Life has less colour without a dog in it.
My first two Llewellins weren't littermates but were very close in age and after the second died I resolved to never have two dogs the same age again. Was just too hard. So with Scout now turning 7 this coming spring, I am on the hunt for a new Llewellin puppy.