Hunting and poaching: The Philippine deer is hunted for its meat, skin, and antlers. Deer hunting is a popular pastime in the Philippines, and enforcement of hunting regulations is weak. Poaching is also a major problem, as deer are often killed for sale in local markets.
Disease: The Philippine deer is also susceptible to a variety of diseases, both introduced and endemic. One of the most serious threats is the foot-and-mouth disease, which can cause severe illness and even death in deer.
Competition with other species: The Philippine deer also faces competition for food and resources from other species, including introduced deer species such as the rusa deer and the sika deer. These introduced species can outcompete the Philippine deer for food and habitat, and can also transmit diseases.
The Philippine deer is an endangered species, and its population is declining rapidly. Unless effective conservation measures are taken, it is likely to become extinct in the wild.