I'm so sorry to hear this
I know exactly how you feel. My dog passed away last year and was fine one day and then at death's door the next day. He was 11 too. It was a lot to take in.
Pets really do become part of your family and it is truly is heartbreaking when you lose a pet, especially when it happens suddenly
don't feel like you need to hold in how you feel. If all you want to do tonight is lounge about cry, you have every right to and it'll help you come to terms with things if you don't try and bottle it up. Grief has no time limit so just allow yourself to feel what you will feel and just let it out. I felt a mix of sadness, anger at my mum, myself and the vet for not being able to save him even though I know we all tried and these things sadly happen and I also felt a relief because even knowing he was in pain for a minute, broke my heart so it was good to know he was no longer suffering. The first few days after it are the worst. The house seems so empty even if you still have other pets and you might keep thinking you hear or see them. It does get easier but you never stop missing them.
2 years on since I lost my cat to cancer and a year since I lost my Yorkie to pancreatitis, I still think of them every single day and miss them so much and often still have a wee cry over them but I also smile now when I think back on them. I couldn't do that for a while as I was too raw.
I truly am sorry for your loss and I hope you know we are all here for you on here and you're not alone
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