* Different Needs: Horses and deer have very different dietary, habitat, and social needs. Horses are grazers and need large open areas, while deer are browsers and prefer forested areas with diverse vegetation.
* Potential for Conflict: Horses are much larger and stronger than deer. They could easily injure or even kill deer if they felt threatened or competed for resources.
* Disease Transmission: While not impossible, there is a potential for disease transmission between horses and deer, especially if they share food or water sources.
* Stress and Behavioral Issues: Being in close proximity to a species they are not familiar with can cause stress for both horses and deer. This could lead to behavioral problems like aggression or anxiety.
In summary: Mixing horses and deer is generally not a good idea due to their different needs and potential for conflict.