I'm going to have to assume you are referring to South Beach based on nothing other than your category being "Home Buying in South Beach". I hope what I provide is appropriate.
In South Beach itself, you do have South Park. It is a small parcel that many folks and their dogs play together. It's relatively quiet and surrounded with excellent shops, etc for pampering yourself once your companion is done. There is also a park above the baseball stadium landmarked by a piece of artwork known at Cupid's Span. There are lots of dogs here each day on and off leash. Finally, and it's officially considered Rincon Hill but pretty close by, is the Rincon Hill Dog Park underneath I-80 at Beale and Bryant Streets.
Here are some helpful links for your review:
South Beach info: http://www.sanfranciscodays.com/soma-south-beach/
Rincon Hill Dog Park: http://www.trulia.com/blog/gabriel_rojas/2011/12/rincon_hill
Rincon Hill Dog Park II: http://www.trulia.com/blog/gabriel_rojas/2011/12/rincon_hill
I think if you use sites like Yelp.com for dog services, etc and simply talk to other dog owners in the area for recommendations you should find exactly what you're looking for.
I hope this information is useful to you and good luck!
There are also a few dog grooming places in Soma - Here's a few that are nearby in the neighborhood:
I have a list of dog friendly parks, etc. Normally, I do not ask for emails. But I am clueless as to the way to scan the information onto Trulia.
If you email me @ email@example.com, I do know how to scan from Hill & Co's scanner and send to any email address.