And Rocksie says thanks for the good thoughts :)
Aside from boylema's advice, mine is to watch her calorie intake since she won't be burning energy! If she's like my dog, she eats just to burn all.that.danged.energy! So without activity she needed less food.
We have a corgi, and worried about confining her, but I think it was a relief for her because she knew she wasn't feeling right and didn't feel like she had to move around for her daily routine. As soon as I realized this, I relaxed and she did too! The first couple of weeks, really the first four until we got the ok to start activity, she was in her crate if we could not devote all attention to her. This was for her safety since I *knew* she would try to hop on and off the sofa or run downstairs (we live on a second level with the stairs in our unit). Yup, as soon as we blinked, she hopped up or dwn or went downstairs. She was ok, but we decided it wasn't worth the catastrophic risk.
Corki was the same as Cooper. At first, she was like blah. That lasted about a week when her phentanol (sp?) patch came off. Then she was more herself and realizing her leg felt pretty good and wanted to move. That's when we started mental stimulation. I highly recommend meals in a treat puzzle, because it'll wear them out safely!
Corki ignored her stitches, but she still got the cone when we couldn't watch her 100%. She also got the cone for a few days after her stitches came out per doctors rec. The surgeon said too many times he's seen a very healthy wound licked open. Part of that though was because her wound was dehiscing (clear liquid seeping out of it, generally from activity but she did no activity so I'm not sure) which made licking more appealing. Once I was able to clean it and watch her behavior for a weekend, the cone was gone. (No baths for several weeks, like until full activity resumes so she doesn't slip!). DO NOT CARRY THE DOG, SHE'S TOO BIG. If you fall, it is dangerous for both of you, she can't catch herself. Don't have DH carry her either, and don't tag team. Do this instead with a towel, of course at a minimum, but good for stairs, or one stair even, to potty or go to bed.You can help lift as much as needed, and if her leg slips, you are holding her anyway, so no injury. (Take off the cone for potty, but put on a leash in place of the cone so you can control her.
I took time off work to care for her, which was unnecessary since she lived in her crate, but it was good for me. Sometimes my brother would come over to give her pain meds during the day because I did not want to get behind on those! DH takes an early lunch so he'd come home mid morning and I take a late lunch so I'd come home mid afternoon. These visits were more for me, because even when she's feeling great she sleeps like a log all day.
Your dog looks healthy and strong, which is a h.u.g.e advantage! The muscles will weaken, and my dog had some huge leg muscles from snow in the winter, herding a frisbee year round, and swimming in the summer. Because she had more muscle, her atrophy was slower, and recovery easier. Also, keep your dog on the lower end of healthy weight for life. And with the loss of activity, watch her food intake so she doesn't gain weight.