- Turn off the TV
- Put the dog out, and send the kids to the neighbors
- Pick a spot and stay there
I've never gotten a 2-way conversation from a potential hire when I hear the TV in the background. I usually hang up with a "Well, thanks for answering my questions, we'll call you," instead of scheduling an appointment. TVs and computers are the #1 distraction.
If the dog or cat is going to bark, meow, or demand attention, you'll have to put them outside, or at least in another room during your phone interview.
Ideally, have someone else watching the kids, where they won't decide to come and interrupt you. At the very least, pop a video in for them and explain that you can't be interrupted on the phone right now. Warn any one else in the household about the importance of your call. Boisterous roommates have ruined job interviews.
It will help you to have all your materials together in a quiet spot where you can focus all your energy and attention on your interview. Imagine an in-person interview: you wouldn't be wandering around the building.