Who changed Pearl's on me

  When I was at the vets picking up Pearl she seemed just fine for going thru major surgery. When we get home and in the house she stops to get a small drink of water then heads upstairs to my bed to rest. That made it easier to place a warm wet towel and hold it on her swollen tummy as per instructions from the vet.  Gretchie is up there with us being a good sisser not being a bit jealousy like usual. Letting me take care of Pearlie girl. Pearl lets out a moan every now and then but no whining or whimpering while we were taking a short nap. I get up and decide to go down stairs to make a hamburger with cheese for lunch. Gretchie is at my heals as normal but Pearl stays sleeping as normal. Then who should appear in the kitchen doorway when the hamburger is plated and I have just taken my first bite. Well,that would be Pearlie Girl looking at me and begging for a bite. She has never done this before in all the time she lived with me she would rather stay sleeping on the bed. I say "Who did I bring home with me from the vets" ? She looks and sounds and smells like my Pearl but she not a sleepy dog like my Pearl was. Pearl might of been sicker than I thought and with the tumour gone she feels more like being awake...let's hope so. I will love her no matter what cause she is my Pearl. I love her and Gretchie just the way the way God made them.