Very small dog bite by vaccinated pet friday pm. tiny bite is fine.saturday low grade fever, chills, muscle aches, tight chest feeling. related? flu?

Doubtful: Unless you received tetanus shot or rabies prophylaxis which may be a reaction to these. Your symptoms are not related to dog bite. Check with the PCP that treated you.

Probably unrelated: If a bite/scratch is infected, it almost always gets red, swollen, painful. Your symptoms are likely from an infection from a different source.

Urgent Care: Whether it's related or not, you have considerable symptoms which warrant you to be seen.