Dognappers have taken a liver and white springer spaniel called Bramble from her kennel in the back garden of a house in Bannut Tree, Bromyard.
Tina Halling, 18, was given the dog when she started high school.
She said: "My family are devastated. We just want her back. She's part of the family and the last few days have been unbearable without her.
"It's like we've lost a younger sister."
The dog, aged seven, was taken between 9pm on Wednesday, March 15, and 12.30pm on Thursday, March 16.
Anyone with information should contact Dave Green at Hereford Police Station on 08457 444888, or call Crimestoppers anonymously on 0800 555111.
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