Sit, Stay, Love (слэш)

When Harry takes Teddy to an animal shelter, he hopes to ease his constant whining for a pet.
But of course the one dog Teddy falls in love with already has another favourite person: Severus, a grumpy, taciturn volunteer whose intense eyes make Harry squirmish.
How can Harry keep himself from falling for Severus, and will the man ever return his affections?
Or
Snarry but with a lot of fluffy animals and people playing matchmaker.