Mongrel Heart, a boutique dog services agency located in the East Village, offers dog-walking, dog-sitting and dog-boarding services. We also bake our own homemade treats! The founder, poet Stephanie Berger, grew up around a wealth of animals in Southern California. Her happiest childhood memories involve playing with her golden retriever mix, Aspen. Because dog services and writing are her two careers, she works from home and will have plenty of time for your pup. Mongrel ...