Wake the F#CK up w/Jeff #160- stopping my moms dog from going nuts on the leash

I am out in San Diego and they have a little white fluffy dog, maybe 15#, it explodes at other dogs, she walks it on a harness, i mind my business, i don't train my families dogs but the dog explodes when it sees other dogs, so she crosses the street when she sees other dogs, i told her this was bullshit so i showed her a simple one second technique and we walked by the dog.