What is DHPP4L?

Answer 1

A 4 in 1 is actually a cat vaccine.

It vaccinates against FVRCPC:

FVR -Feline viral rhinotracheitis

C - Calici virus

P - Panluekopenia

C - Chlamydia

A 5 in 1 is a dog vaccine and vaccinates against DHPP

D - Distemper

H - Adenovirus types 1 & 2 (includes Hepatitis)

P - Parainfluenza

P - Parvovirus

If you add Lepto, that makes the 5 in 1 a six in one (6 in 1), DHPP4L (4 strains of Lepto protected against).