I just read Puppy Love by Lucy Gilmore which is currently on sale from Sourcebooks for $1.99. She also writes as Tamara Morgan. The hero is a big, gruff, scary firefighter who is diabetic and is given a tiny Pomeranian puppy as a service dog to alert him if his blood sugar drops too low. I loved it! Growly heroes and adorable fluff ball pups for the win!
Puppy Love