The Dire Reaction by M.A. Cobb

As a veterinarian, Dr. Danielle Michelson was excited to be involved with a new genetic therapy designed to help fight a common pet ailment. She even knew the perfect canine to enroll in the treatment, one belonging to the tall blond cowboy, Sam Downing.
Little did she know, while things were heating up between them, the world itself was transforming.
The cure turned into a curse, and created an army of monsters that thrive on pure chaos and destruction. The worst of them all, was someone they both knew.
Now, they must find allies to fight back against the onslaught of carnal evil that threatens to overtake them.

Will Dani and Sam survive the monstrous terror that is overrunning their city? Or will the hordes of ravenous creatures consume everything, and everyone, in their path?