Hepatitis vaccine?

usually combined with the distemper vaccine

Hepatitis is a liver infection -- it can sometimes be bacterial and sometimes viral (it's the viral infection in humans that is so bad, but it's a different thing in dogs).  It's pretty rare actually (altho Billy had a bacterial hepatitis last year but that's not what they vaccinate against). 

Leptospirosis is a whole different disease. 

Jewlieee

Is this the same as lepto? Or is it combined with the distemper vaccine? Or is it something all together different?  

I imagine you mean "Is Hepatitis given in the same shot as Lepto?"   Not usually. 

Vaccines are given in various combos.  Three combos are

• Distemper + Parvo    (DP)
• Distemper + Hepatitis (actually Adenovirus) + Parvo + Parainfluenza    (DHPP)
• Distemper + Hepatitis (actually Adenovirus) + Parvo + Parainfluenza + Lepto    (DHLPP)

Lepto should only be given to at-risk dogs and never to pups under 12-weeks.  Pups and toy dogs are at a higher risk of serious reactions.

The vaccine for Adenovirus (CAV-2) cross protects against Hepatitis.  Hepatitis (CAV-1) is not necessary.

ETA:  Added the 3rd combo.

ETA:  If you decide to vaccinate against Lepto, get a vaccine that includes all four available serovars (strains).  There are other strains for which there is no vaccine.