The same happened with our black Lab 4 years ago... we were exactly as you are now.
Condolences to you and everyone who is feeling your pain.
On our side... some 4 months later, we rescued a Bichon before going to the pound. The poor thing was accused of biting everyone.
It turned out that their 2 year old continually pulled his tail, they left the dog outside in the heat until cramps set in... and then, they got a Terrier, which took the spot light and bullied the smaller dog.
All in all, we needed to fill the vacancy, and this little rescue needed love and attention. The match made a huge bond for our family and the little guy.
Never had a small dog before... but now, I don't think I will have another big dog... these little guys don't yip-yap, and they travel on trips well.
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Things will get better, after you spend time grieving and remembering...
Love, to you and yours,