Fuming Inna Milovanova wrote: "Would be better to ink her forehead with a tattoo saying 'Idiot' and break her finger for torturing a defenseless animal, poor kitty."
Outraged viewer tatakuksa posted: "You just can't torture those who are weaker then you, it is not a toy, it is a living being. She did not put a tattoo on her chest."
Ivanickaya hit back, saying the spoiled cat, which has it's own Instagram page and eats fresh oysters, leads a better life than the people complaining.
She said: "This cat's life is better then yours. Maybe it is hell for you, but he feels just fine.
"He has not been castrated and he never will be, this would be real cruelty.
"I checked with the vet before getting him a tattoo and they were fine with it and a vet was present while they were doing the tattoo, so everything was under control."
She added: "The cat is treated with love and care.
"He is very smart and enjoys his happy life. The tattoo was made on the upper layer of skin.
"Only 1-2 millimetres, he did not feel any pain. Right after the procedure he behaved normally and started to go on with his normal routine."
But the blonde who describes herself as a "fitness athlete" could now face charges of animal cruelty.
Police spokesman Natalia Chovpylo said: "If we establish that the animal was tortured, we will open a criminal case."