Pack theory is bollocks a small amount of research on the internet will explain why also search the threads on mn there will be hundreds of them.
You do not have to be a leader of your dogs - dogs are honestly not trying to dominate us or take over the world by sitting on sofas
Read some decent literature:-
General dog books
Inside of a Dog: What Dogs See, Smell, and Know: What Dogs Think and K
now by Alexandra Horowitz
Bones Would Rain from the Sky: Deepening Our Relationships with Dogs by
Suzanne Clothier
How dogs learn by Burch and Bailey
Excel-Erated Learning: Explaining in Plain English How Dogs Learn and How
Best to Teach Them by Pamela J. Reid
Dog Language by Roger Abrantes
On Talking Terms with Dogs: Calming Signals by Turid Rugaas
Canine Body Language: A Photographic Guide: Interpreting the Native
Language of the Domestic Dog by Brenda Aloff
Understanding the Silent Communication of Dogs by Rosie J. Lowry
Dominance theory is bollocks Books
Dominance in Dogs: Fact or Fiction? by Barry Eaton (small but vital book - easy and interesting)
In Defence of Dogs - Why Dogs Need Our Understanding by John Bradshawï‚§ The
Culture Clash by Jean Donaldson
Oh Behave by Jean Donaldson
Dominance Theory and Dogs by James O'Heare
Bonding With Your Dog by Victoria Schade
The Other End of the Leash: Why we do what we do around dogs by Patricia
McConnell
Dogs are from Neptune by Jean Donaldson
100 Silliest Things People Say About Dogs by Alexandra Semyonova