Oh no, I am so sorry to hear this, ugh, heartbreaking. If it can provide some comfort, an angel comes for every animal. I watched it happen.
When I had to put my Lenny down at the vet, I was still holding him after they euthanized him, crying ridiculously hard when suddenly, I was transported to a 'white room with no walls or ceiling' just pure whiteness, the love, and warmth I felt were incredible, indescribable! I watched as Lenny jumped all around in his youth once again in the 'white space' and playing so happily, then unexpectedly, he jumped back into my arms - as if on cue. I was looking down at him when suddenly, out of nowhere, I saw a white translucent robe (cannot describe the material, it was breathtakingly beautiful) flowing in front of me, then male hands reached out to me to accept my Lenny. I was crying so hard, I didn't look up to see his face, that was my last concern; I was in too much grief. I then handed him over to the angel and watched as the angel held him, caressed him so gently and placed Lenny to his chest and just loved him. I was bawling so hard at that point. Within seconds, as quickly as he appeared, he disappeared, and I was immediately transported back to the vet's office, still holding Lenny's lifeless body. Miraculously, Lenny's 18-year-old fur started to change back to a young cat's fur, beautiful and full, once again - we couldn't believe what we were seeing as the whole family stood there in total amazement.
An angel came for Squallie,

and Squallie is young once again and in perfect health! When it is our time, our animals will be there to greet us. Squallie is still with you, you can do no wrong in his eyes. You loved him, that was all that mattered, be proud of that love; he loved you. It is an honor to be loved by an animal! Allow yourself to grieve, allow yourself to 'see' Squallie, he is still a gift to you.