Lost my best friend

I just lost my best friend of 13 years. He was an exceptional dog. He understood everything and was a source of nonstop love, companionship and support. I was able to overcome many hardships because I had him at my side. I am overcome with guilt because in his last few months we moved and had a baby (who he was incredibly sweet and gentle with). I feel that he didn’t have the attention and stability he needed, despite his being dedicated to my wellbeing for his entire life. I am so devastated by this loss I can’t stop saying out loud, “what do I do now?” I feel like I’ve lost a limb. Please all hug your dogs extra hard for me and enjoy every moment with them.