Every dog that has an owner obeys him
This is a tricky sentence to symbolize. First we must determine the referent of the anaphoric pronoun 'him'.

All dogs bark
Someone works for Nadia
Everyone loves someone
Some cup was put on every table by some man
There's a time at which everyone eats every doughnut
Only philosophers wear only diamonds
Every cat that cleans himself cleans an animal that catches mice
If someone is tall, then he is bigger than Rachel
The man Karen adores is friends with Bob