A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users. Although the means to carry out, motives for, and targets of a DoS attack may vary, it generally consists of the concerted efforts of a person or people to prevent an Internet site or service from functioning efficiently or at all, temporarily or indefinitely.
Do *not* forget to protect yourself first, and to do proper reconnaissance.
Watchdogs. Some actively sniff, some only use their nose passively. Some bark, some bite, and some can do both (but usually not at the same time). And not just watchdogs, other animals can guard the place as well, maybe even better. Each species has been domesticated for particular species detection. And some would-be-predators make for excellent prey.
My dogs are led by a shark and hunt together in one pack