The Soldier's Promise (Harlequin Super Romance Series #1917)

Here today, gone tomorrow? 

When former army ranger Josh Manning comes to close-knit Covenant Falls, he knows he won't be staying long. As soon as he's renovated the cabin he's inherited from a late fellow soldier, he and his ex-military dog, Amos, are getting out fast. That is, until Mayor Eve Douglas drops by. 

Eve, a young widow, has a precocious son and a band of misfit pets. Definitely not his type. Besides, she deserves much more than he can give. Unless, against all his instincts, he's ready to make one more promise.