My oldest girl, 12 now...that's her photo at the side, always had a really good coat, very straight, silky & thick, that trailed the floor it was so long.
Last summer it was quite hot here, an unprecidented event up here on our moors where the rain constantly blows sideways

. She's on medication for heart failure & was really struggling in the heat, so I cut her coat very short to help keep her cool. I've let it grow a bit since but keep it at about 2 to 3 inches; as it's thick it's enough to keep her warm without troubling her with too much grooming. As it's grown it's become wavy without the weight to drag it down.
It actually looks really nice, cute, & gave her a new lease of life so she acts a bit like a puppy now as well as looks like one!