The RSPCA is asking for information from anyone who may have noticed a pregnant dog going missing from March 19 in the Solihull and Birmingham area.
It follows the discovery of the body of a large Staffordshire bull terrier cross bundled inside a sleeping bag in a field on the edge of a
farm in Catherine-de-Barnes in Solihull.
The dog, which was a brindle colour, was emaciated and had numerous bite marks and scratches on her chest and front legs.
She also had a suspected broken left front leg.
She was about 100 metres away from a road and the sleeping bag she was concealed in was a navy blue, Arizona Deluxe made by Eurohike. It is believed she was dumped there either on March 19 or 20.
RSPCA inspector, Ben Jones, said: "The dog's nipples were swollen and still oozing milk indicating that she had only recently given birth.
"From the bite marks we think she may have lived with at least one other dog.
"Obviously we are anxious to get any information we can on who might have dumped her in the field, but we are also concerned for the fate of her pups, who may be only weeks old and in severe need of their mother."
Please call the RSPCAs cruelty line on 0300 1234 999 if you have any information about a dog fitting this description that has recently disappeared.