Incissions heal side to side not long ways. It takes a sterile wound two weeks to heal. She should be able to do ok in 4 weeks. As the man above said let her set her pace. If you cannot do it earlier I think she'll be fine. I once had an English pointer shot completely through the chest where I would have aimed to kill her. I had a neighbor who had yard chickens and she got out one day. I never knew if he did it and I did not want to know. this was almost fifty years ago. I thought she'd be dead shortly and thought if I opened her chest up , I'd do more harm likely than good. It was a long night! I put her on injectable penicillin and she bounced back the third day. I rested her two weeks and carefully took her hunting. She did fine. I think the bullet a fraction of an inch in any direction would have killed her in seconds. I did nothing other than shock treatment, penicillin, rest and TLC. No one was more amazed than I was. She was tough. Best fetch dog I 've ever had. She was the first dog I ever trained, and she taught me a lot! LOL I forgot to say I am a retired vet.