Once in a while a dog can enter into season without showing any of the typical signs. This is known as silent heat. This is different than a skipped heat, in which the dog's cycle does not occur at all. If a Beagle has very light discharge some owners may mistake that for a silent or skipped heat. However, in either case this is due to abnormal fluctuations with hormones and should be pointed out to the veterinarian if it happens more than once.
Your un-spayed female Beagle will be the "chase" of every un-neutered male dog within a 3 mile radius. Un-neutered male dogs of any breed will pick up her scent from this distance. Each time that a female in heat urinates, some blood is deposited along with that, which leaves a strong scent in the yard.
It is highly suggested to always accompany her outside during this time, only go outside for elimination reasons and to keep her on a short, 6 foot leash.
When you are getting ready to bring her out, open the door slowly and have a good look around before you allow her out with you.