Make sure your fire prevention is up to snuff, and that your automatic waterers are doing their jobs.
This Stable Management special issue on controlling mosquitoes, flies, gnats and ticks on horses and your property is brought to you by the UltraShield line of products from W.F. Young.
Drainage problems are the reason horse farms get mud in paddocks or fields.
You can reduce the "bog effect" if you take time to notice where water runs and settles after a rain, and plan your landscaping strategy accordingly.
There are ways to diminish mud in high-traffic areas on your horse property.