PET PEST is a term used to describe two common pests that can be found in households. The first pest is fleas, which are small, wingless insects that feed on the blood of mammals and birds. They can cause skin irritation and transmit diseases. The second pest is ticks, which are small arachnids that feed on the blood of mammals and birds. They can also transmit diseases and cause skin irritation. Both fleas and ticks can be difficult to get rid of, so it is important to take preventative measures to protect your home and pets from these pests.