A subsequent tweet showed Gary still waiting at the window:
Ms Fisher, who spoke frankly about living with bipolar disorder, obtained the animal as a therapy dog.
In a 2013 interview with the Chicago Herald Tribune she said: "Gary is mental also. My mother says Gary is a hooligan. Gary is like my heart. Gary is very devoted to me and that calms me down. He's anxious when he's away from me."
Ms Fisher was a supporter of animal rights group PETA, which issued a statement following her death saying: "It was the love of her dog, Gary, that helped her cope with her bipolar disorder.
"She proved her devotion to dogs in need in June of this year, when she joined a demonstration outside London's Chinese embassy to call for a ban on the country's annual Yulin dog-eating festival, in which thousands of dogs and cats are bludgeoned or even skinned alive before being butchered for meat."
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"These poor dogs need us to fight for them," Fisher was reported by PETA as saying. "Every single one of them is as precious as my dear Gary, every one of them is someone's best friend."
"Fisher," PETA added, "will always be remembered for her sensational talent, passion and honesty as well as her love for her dog and dedication to helping others."
