5 is too many. Take it from me. I'm watching 5 this weekend in addition to taking care of my mom who is having a rough time. Wife kitteh is off in Arizona at a friend's wedding. I had planned to go, but dogs and momma kitteh intervened.
At the park with 1, 2, 3, 4, 5 dogs. One is deaf and wanders off in the wrong direction and one is utterly undisciplined. The three original Catican Guards are awesome.