I watched a feature on JCF and his tennis academy on TTC last year, and it showed his insanely adorable dog
I don't know whether it's the same creature as the one on his racquet in that picture.
Yeah I know the one, the 'No Strings' Episode. His dogs name is Roca, she's half Maltese, half Lhasa Apso (JC just loves his Maltese girls (I'm from a Maltese background hehe)) and according to JC 'she's crazy'. In the video, the dog was going mental running onto the tennis courts and running away with the tennis balls. She's adorable. And she's the one on JC's racquet, and inside his coat.