Traps, poison baits, repellants might be used to get rid of them. Some of these feed on the insects in the lawn. Killing them might kill the larger creatures when they fail to survive in absence of food. Liquid or pellet baits are highly effective in case of snails and slugs once you find out their hiding places under the dead, dried leaves. Fencing may keep out dogs and deer from your area.
Plants draw nutrients from the soil.
Soil is the home of the roots. So proper maintenance of the soil is needed to reduce fertilizer and pesticides applications, which can be detrimental sometimes, and enhance root growth and development. So soil needs replenishment on a regular basis with sufficient air, water, fertilizer, pH balance and organic matter. Test your soil, determine the soil type to understand it's aeration and water holding capacity, fortify it with sufficient amount of nitrogen, phosphorus, iron and potassium, correct the pH by increasing or decreasing according to need you will have a luscious, green, velvetty, spongy and inviting lawn. Gypsum is said to improve soil as well as plant conditions.