Where can you find a list of linking verbs?

Dogs make wonderful pets because they us stay happy and healthy. the topic sentence is "dogs make wonderful pets." , is this correct? i keep doubting myself.

2dogs and 2 humans how many people are there? animals are considered as people too?

Which is a run-on sentence? a) all of the fish that we caught were too small to keep. b) ricky changed the oil, he forgot to replace the oil filter. c) the striking patriotic design surprised the memorial planning committee. d) everyone on the harbor cruise reported feeling a little seasick and left early.