Think it's a no for cats and garlic. Just come across an article, in a nutshell:-

"dapted from “Herbal Cat Care” by Dr. Randy Kidd (Storey Books, 2000).

People who feed raw garlic to their dogs report great success in keeping fleas away. Garlic also has anti-cancer properties, shown to inhibit canine tumor growth. But is garlic safe for cats? And what about onions? If they’re good for you, shouldn’t they be good for your kitty?

Not necessarily. Get the whole story here.

According to Dr. Randy Kidd, the use of garlic, as well as onions, shallots, and chives, has been shown to cause damage to feline red blood cells which can result in hemolytic anemia and eventual death. Raw garlic and onions can also cause ulcers and irritation of the mouth, esophagus and stomach.

His recommendation: Avoid giving garlic and onions to your cat!"