What does Lennie get excited about?

he was excited that slim's dog had puppies

The word excited in that sentence is not an adverb but an adjective because it describes the subject. An adverb desrcribes an adjective, verb or another adverb.

if a particular person is excited about something than one uses his skill and knowledge to give best of what he has resulting in good quality of performance and his work is appreciated by others. for...

You eat lots and lots of sugar which gives you high pressure

please complete your question.