allium sativum

Dr. Mona Boudreaux, D.V.M. says,
"Give [your pet] garlic.
This pungent herb repels mosquitoes, cleanses
the blood, and strengthens the immune system.
Dogs over 50 pounds can have as much
as two teaspoons of garlic a day, and smaller dogs
can have 1/4 to 1/2 teaspoon a day.
Garlic can be a problem for cats, so don't give them too much.
A safe limit is 1/8 teaspoon or less
a day for up to two weeks at a time."