I worked in a vet clinic that did a lot of orthopedic surgeries, especially ACL surgeries.
In a dog that size, we would not have done both knees at the same time. After that type of surgery, they have to keep weight off the leg for several weeks to allow it to heal properly. Obviously, if both knees were done, he'll have to put weight on both legs... this can be very painful, and he's at higher risk of damaging what was reconstructed. Be VERY careful with him - I hope your vet told you to keep him confined, and only allow short leashed walks a few times a day. Home care is the most important factor in how these guys do post-op. You may also want to look into physical therapy - range of motion and muscle-building exercises are important, and swimming (once the sutures are out) is a great way to do this.
Did they send him with pain killers? There are several very good medications that can be prescribed to help with the pain, and he would certainly benefit from one.
These meds can also cause him to be drowsy, to go off food for a bit, and even not have BM's. This is OK for a day or two, but consult your vet if it lasts any more than that. It's a big surgery that he went through (especially if both knees were done together), so he'll need some time to adjust and regain his bearings!
Good luck.
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