Most common hedges are safe for both kids and pets, but there are a few notable exceptions. Yews (Taxus spp.), for example, contain a toxic compound that can cause serious illness or death if ingested. Other potentially harmful plants include Leyland Cypress (Cupressocyparis leylandii), azaleas (Azalea spp.), and oleanders (Nerium oleander). If you're unsure about the safety of a particular plant, it's always best to err on the side of caution and choose something else.
Some of the best options for kid- and pet-friendly hedges include Green Mountain boxwoods (Buxus X ‘Green Mountain’), hollies (Ilex spp.), evergreens such as cypresses (Cupressus spp.) and low hedge Rocky Mountain Juniper (Juniperus scopulorum). These hedges are all relatively low-maintenance, so you won't have to worry about them too much once they're established.
When choosing hedges for your property, it's important to consider the needs of both kids and pets. Some plants, like yews, can be toxic if ingested, so it's best to avoid them if you have young children or animals. There are plenty of other options that are safe for both kids and pets, so take your time to find the perfect plant for your family.