Telling them apart

Cheetah vs Jaguar

These two are in the same family, so the differences are in the detail.

Cheetah

Cheetah

Acinonyx jubatus

Jaguar

Jaguar

Panthera onca

Field marks
Cheetah
Jaguar
build

Build is distinctly slim, with a deep chest, long limbs, and a small streamlined head.

en.wikipedia.org

Build is compact and muscular, on legs noticeably shorter than other big cats of the same weight.

en.wikipedia.org
coat

Coat carries around 2,000 evenly spaced, solid black spots each measuring roughly 3 to 5 cm.

en.wikipedia.org

Rosettes are large and dark with a small central spot visible inside each.

en.wikipedia.org
face

Two solid black lines run from the inner corner of each eye down to the mouth.

en.wikipedia.org
Not recorded
tail

Tail ends in a prominent bushy white tuft.

en.wikipedia.org

Tail is proportionally very short, the shortest of any big cat.

en.wikipedia.org
Vitals
Cheetah
Jaguar
Mass
37.9 to 58.8 kg
50.4 to 83.9 kg
Height
67 to 94 cm
57 to 81 cm
Lifespan
up to 20.5 yrs
up to 28.4 yrs
In the field
Cheetah
Jaguar
Active
Daytime (diurnal)
Night (nocturnal)
Status
Vulnerable
Near threatened
Recorded in
Namibia
Costa Rica

Their recorded ranges do not overlap in the atlas, so a sighting is very unlikely to be ambiguous in the field.