The Cavern: Cherie by Margery Ellen

Cherie Sterling is an animal control officer in Butte, Montana. She has a unique gift of understanding animals, wild and domestic. She never dreamed that one day, while investigating a case of animal cruelty, she would lose her heart to Smokey, a sickly bear in a filthy cage. She would soon learn that Smokey, the bear, was Ryder Greene, a shifter, and she loved him.
Now pregnant with twins, Cherie was beginning to regret falling in love with Ryder Greene. She was always alone. Ryder spent all his time managing the Ryder Rescue Center, located in the cavern where he was once a prisoner.
Jha Ramandem finds Cherie not breathing in a house filled with gas. After CPR and mouth to mouth, Jha saves her but he is worried about the babies. The attempt on Cherie’s life sends her into hiding.
Ryder can’t find Cherie and no one will tell him where she is or why. Neither Cherie nor Ryder knew that Cherie was in danger. A special patient, part werewolf, part vampire, staying at the Rescue Center, would save them both.