Here's why:
* Leeches are blood-feeding parasites, meaning they don't live in or on their host like other parasites. They feed and then detach, often leaving the host unharmed.
* Parasites that leeches carry are usually specific to their own species, meaning they are not adapted to live in dogs.
* Dogs have a strong immune system, which helps them fight off infections, including parasitic infections.
However, leeches can still pose a health risk to dogs in other ways:
* They can transmit bloodborne diseases like Lyme disease, although this is rare.
* They can cause irritation and bleeding at the bite site.
* They can cause allergic reactions in some dogs.
If you find a leech on your dog, it's best to remove it carefully and monitor your dog for any signs of infection or allergic reaction. If you're concerned, consult your veterinarian.