The following is an example of what poetry term?The mas cat had a bad scratch

The line is an example of assonance.

Assonance is a poetical device that consists of the repetition of vowel sounds in multiple words that are in close proximity. This device helps create internal rhymes, that is, rhymes inside the sentence rather than only at the sentence's ending.

In the particular line we are analyzing here, the repetition of the vowel sound is represented by the same letter in all words:

The mad cat had a bad scratch.

See how they all sound and look similar? However, different letters may represent the same sound. So, what we are looking for to classify something as assonance is sound, not spelling. Take "sheikh" and "bake", for example. The same sound is represented by "ei" and "a" respectively.

In conclusion, the line provided in the question is an example of assonance due to the repetition of a vowel sound that creates internal rhyme.

Learn more about assonance and other devices here:

i go to the store and buy some cheese,suddenly there was akward silence.   out of no where comes a ninja, and he takes an apple, and chokes the cashier, until he passes out.   the disapeared in a puff of smoke.   the cashier went to the doctor, and everything was fine again.   they all lived happily ever after without anymore ninjas.

the end

go to buy cheese= exposition

akaward silence= rising action

ninja chokes the cashier= climax

cashier goes to the doctor= falling action

they live happily ever after= resolution