http://www.brittline.com/2012/01/04/ant-repellent-for-pets/
There are many different types of ants that can enter the home. Ants are pesky and bold by nature and will infest honey, sugar and other sweet substances; therefore it is important to get rid of them using a natural ant repellent. When using repellents, pet owners have to be extra careful to use something that is a safe ant killer for dog and cat. Some good options for a natural ant repellent are as follows:
Black Pepper Or Vinegar As A Natural Ant Repellent
Ants have an extremely strong sense of smell. They have millions of receptors on their antennae with which they can take in the aromas of food. Vinegar and black pepper both have a very strong smell. A few crushed pepper corns give off a strong aroma which is too concentrated for the ant and this is sure to repel then. A few teaspoons of vinegar used to wipe the counters in the kitchen clean also give off an aroma which is way too strong for an ant to bear. Ants who find food, leave pheromone trails behind them so that the others from the colony can get to the food source by following this trail. Strong smelling substances like pepper and vinegar interfere with this activity by wiping out pheromone trails. Pets keep away from pepper and even if ingested, it is not harmful, which makes pepper a safe ant killer for dog and cat.
Clove Oil As A Natural ant repellent
Anyone who has used clove oil as a toothache remedy will know how strong the smell of clove oil is. It won’t leave your fingers for days. This natural ant repellent works a lot like pepper and repels ants with the intense smell. Drawing a line of clove oil on all entry points will keep the pests at bay. Clove oil will destroy their pheromone trails and will also drive the ants crazy. Clove oil is a safe ant killer for dog and cat.