Do you dogs flex their muscles ..

When Oz sees something in the woods next to the house and he huffs and runs to the fence ,not only does he raise his heckles rise he flex's ever muscle in his body ....

The TM's too hairy to tell.

He does go up on hist tippy toes an bristle every hair on his body out so he doubles in size as he prances like a dressage horse.

My Staffords puff out their chests and raise themselves as tall as possible

Yep Paxton to, he gets right up on his toes and you can see his muscles clearly defined, completely different to his normal relaxed look

Could be a bully trait :P:P

Our Boxers both do it

When Bella sees something she's not sure of she stands really tall (albeit not that huge!) and the hair on her back stands up. Usually its just the tuft by her shoulder blades, but if its something she's reeeally not sure bout, the line of her hair goes up all the way down to her tail!

Bruce does

When I was walking the streets looking for my foster son, he did it everytime he saw a hoodie/s in the dark coming towards us, the chest puffed out and the hackles raised, nothing else other than a very quiet grumble, as his body language changed towards them they would cross over the road before reaching us, and he would ''downsize'' Job done

Mind you it was 3 and 4 am in the morning so he did have his 'guard Mom hat on'

Jake (the little terrier) does - I don't know exactly what he does, but he seems to expand in all areas, like he's been puffed up. We call it his "Pop-eye" mode.

I have a terrier, so yes she does that! Big dog in a small dogs body!

Roxy, on the other hand, hasn't got a care in the world!