I had my Tonka spayed and the next day you would have never known, according to the vet, the younger they are the quicker they recover. We had to keep her in the house for a week and when she went out to potty we had to put her on a leash, no running or jumping. She actually jumped a couple of time without us knowing, before she was spayed she never got on the couch, well 2 days after I came out of the shower and there she was sitting on the couch looking at me like "hey mom, have a seat". As far as temperment, we have not noticed any change, she is actually getting sweeter by the day with her age. If Maggie is use to walking you will have a very hyper dog by the time you can actually walk her. Also check into the laser spay, I don't believe they offer it here, but I was chatting with somone from a mal rescue in Idaho and she was telling me about it. Good Luck.