I think that all animal control is authorized to do is investigate if the animal is being mistreated – so if the animal is barking but has water and shelter in its yard, they can’t do anything.
But if the dog’s owners are notified of the complaint and have done nothing, I think it also qualifies as a “noise complaint” and that can get them a $250 ticket.
At least, this is how it was explained to me by a landlord when I first moved into their property with my dog – they wanted to make sure I was aware of what the police could do if my dog was a talker (he wasn’t).
Cut and paste this into your browser to learn more: https://www.seattle.gov/police/need-help/noise-complaints