Laura Thomas 
Not Just a Dog [EPUB ebook] 

Lost in a Costa Rican jungle for twenty-four hours, Stella is starting to lose hope-until she meets a mangy, emaciated stray dog. She has never liked dogs, but this one seems determined to stay by her side. She gives the dog a name–Dirty–and over the course of three days, he places himself between Stella and danger time and time again. But as their bond grows, the jungle tightens its grip around them…