Clint had been absorbed in his coffee, but when the man came up, he looked up, and managed to catch his question--or at least his gesture.
"....ah, he's sort of working right now," Clint said, between bites, guessing that the man was asking if he could pet Lucky--he got that question a dozen times a day if they were out in public. "Service dog." He lifted one hand and circled his ear with a careless gesture. "Ears. Deaf as a doornail," he added, cheerfully.