Should I get one Safety Harness?

My husband doesn't want me to get one he thinks it looks like lil dog. But I have a 6 month baby and a 4 yr old. I have to drop and pick up my 4yr from bus stop and my 2yr old like to get off the stroller and run. I have a hard time because I have baby on the baby carrier and I have to go after him and carrying him.