Puppy bitten, not eating, can't walk. When should I see a vet?

From the sound of it, she is severely injured and is probably in great pain as well, you will need to take her to the vet, she will probably need an antibiotic course and possibly some pain killers as well.

The pain is an issue but the most important issue at the moment is the infection he has developed, you must take him to the vet ASAP, he will need a course of antibiotics and pain killers (you can't use human pain killers for dogs).

Dollar is suffering from a severe infection due to the attack and is also most probably very very painful. you must take him to the vet urgently he will need a course of antibiotics and pain killers.

It can definitely be the cause, a bite wound can be very painful and tend to get infected very fast, which can cause swelling and more pain. he will need to get it checked by a vet and will probably need antibiotics and pain killers.

Your poor pup! It sounds like he was quite injured from the bite if he is unable to drink water, can only eat slowly, and having some froth in the mouth. I would consider this a medical emergency and he needs to see a vet now. Please take him into one immediately.

The bump is probably swollen tissue, as he was bitten by another dog there is very high chances of him developing a bad infection from the bite wound, you will need to take him to the vet ASAP in order to get the wound checked and he will need a course of antibiotics in order to get better.

I am definitely concerned about Huerra's bite wounds. The wounds on her leg look deep, and I always recommend flushing and exploring bite wounds under sedation since often there is even more damage under the surface. I would recommend seeing an emergency veterinarian. They would be able to prescribe pain medication and antibiotics to prevent infection as well.