This is my mom's experience, but she has given me permission to tell it.
When my mom was pregnant with me my dad surprised her with a rat terrier puppy. They named her Susie and she was always right by my moms side. She went with us on camping trips, to relatives houses and to the beach. She was even in a lot of family pictures.
When Susie was 12 she started to suffer from serious health problems that caused her everyday life to be miserable. So my parents agreed it would be best to end her suffering and have her put to sleep. It was a hard decision, but we know that Susie didn't deserve to suffer.
Not long after Susie passed away my Mom was walking through the living room late at night around 1 and she noticed a small black shadow circling her feet. The only light she had was from the outside lights so she couldn't see much. She said it moved like Susie, but she couldn't see its face.
To this day my mom occasionally sees the black shadow when she's walking at night. She is sure it's Susie.
My mom has a blind cat, Helen and sometimes the cat will stop in the middle of what it's doing and focus on something in the distance. It's almost like she sees something because her head will slightly move like she's watching it.
I once read that some native American tribes believe blind animals can see into the spirit world and I personally believe it especially since animals are already sensitive to spirits.
My Mom also has 2 other dogs and they act like they see something too, they turn their heads to the side and watch something move around.