READ OUT LOUD. Choose which marked text you prefer to practice with - macrons in verse form, or macrons in prose order, or accent marks in prose order, or focusing on the meter. You will find materials for all of these options below. :-)
VERSE MACRONS. Here is the verse text with macrons:
Capra, lupum nōn sponte meō nunc ūbere lactō,

Crēverit ille simul, mea mē post ūbera pascet:

PROSE MACRONS. Here is the same text with macrons written out in prose word order:
Capra, nōn sponte meō, nunc ūbere lupum lactō, quod pastōris cūra iubet, male prōvida. Ille simul crēverit, post ūbera mea mē pascet: improbitas obsequiō nullō flectitur.
STRESS (ACCENT) MARKS. Here is the prose text with accents, plus some color-coding for the words of three or more syllables (blue: penultimate stress; red: antepenultimate stress):
Capra, non sponte meo, nunc úbere lupum lacto, quod pastóris cura iubet, male próvida. Ille simul créverit, post úbera mea me pascet: impróbitas obséquio nullo fléctitur.
ELEGIAC COUPLET METER. Below I have used an interpunct dot · to indicate the metrical elements in each line, and a double line || to indicate the hemistichs of the pentameter line.
Capra, lu·pum nōn· sponte me·ō nunc· ūbere· lactō,

Crēverit· ille si·mul, mea· mē post· ūbera· pascet:

IMAGE. Here's an illustration for the fable (image source) from a 1541 edition of the emblems:

What follows is an unmarked version of the prose rendering to faciliate word searches:
Capra, non sponte meo, nunc ubere lupum lacto, quod pastoris cura iubet, male provida. Ille simul creverit, post ubera mea me pascet: improbitas obsequio nullo flectitur.