Here's why:
* Lump on the head: This could be a sign of a serious injury, like a skull fracture, internal bleeding, or a hematoma (a collection of blood).
* Slobbering: Excessive drooling could be a symptom of pain, shock, or injury to the head or mouth.
Don't wait! Get your puppy to a vet as soon as possible. They can assess the severity of the injury, provide necessary treatment, and give you a proper prognosis.
In the meantime, here are some things you can do:
* Keep your puppy calm and quiet.
* Apply gentle pressure to any bleeding wounds, if safe.
* Transport your puppy to the vet in a safe and secure way.
Please remember, I am not a medical professional, and this information should not replace professional veterinary advice. Your puppy's health depends on immediate action.