Breakdown of Ces chiens sont affectueux, alors que ceux-là sont têtus.
être
to be
le chien
the dog
ce
this (before a noun)
là
that, those (demonstrative suffix)
Questions & Answers about Ces chiens sont affectueux, alors que ceux-là sont têtus.
Can I use tandis que instead of alors que in this sentence?
If alors que can translate to "while," could I use pendant que instead?
Not here. Pendant que means "while" only in terms of time (two actions happening at the exact same moment). Since this sentence is comparing two different personalities ("whereas"), you have to use a conjunction of contrast like alors que or tandis que.
Why does the sentence use ces for "these dogs" but ceux-là for "those"?
Since both adjectives refer to plural dogs, shouldn't affectueux have an "s" at the end like têtus?