She's not in pain as far as we can tell, but her tumour is putting pressure on her diaphragm and it's starting to affect her breathing. We're able to check on her breathing at home because you can hear it so easily when she's on a shoulder. Her tumour is so big now that we can see it growing day by day, and the vet could feel the individual lobes of her liver. She's starting to look a bit puffed up, and her body is visibly lopsided when seen from the top. She has mild bumblefoot from the extra weight and pressure towards her back end. She's gained 160g(!) since last time she went to the vet, but it's all tumour. She's lost body condition. Her cagemate is picking on her because she knows Charlotte's sick, but she's also still hanging out and grooming her.
She's still excited about food and cuddles and she still tries to run around during floor time (her tumour bump gets in the way). She still escapes, tries to jump off the couch, and objects to her health checks. We have her on twice daily metacam and a meal replacement supplement which she loves. We have some baby food for her, and at this stage she can have as much as she wants since she won't live long enough for mid-long term problems to develop.
Her human has had some difficult talks with the vet and while we're hoping she'll pass in her sleep at home we will take her in if it gets to that point. The vet said that what we're looking for is significant difficulty breathing, pain, or if she stops being interested in food. Her human would like to know if anyone has any other suggestions of things we should be watching out for.
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If/when she suffers severe, uncontrollable, unremitting pain; when or if she becomes listless, lethargic, uninterested in food, or her surroundings or you; disengaged -- you will know. Listen to your gut, and walk with her.
From your photos and description, it's not time yet and may not be for a while. From my limited experience with this, the time comes abruptly. I'm hoping she will leave at home, in familiar, comfortable surroundings.
You are caring for her just beautifully. My very best wishes, thoughts, blessings and comfort to her and to you.
I hope as well that she'll leave peacefully in her sleep, but if it does get to the point of needing to take her in, I have a suggestion- maybe it's obvious, but I didn't think of it till just the last minute (well, hour actually) when I had to take one of my ladies in for her last appointment a month ago. For her last day/meal, get new fresh veggies from the store if she's still able to eat on her own at all. My Lilo wasn't interested in the lettuce I had on hand which was only a few days old but while we were saying goodbye at the vet's, I had my husband run out to get her a fresh head of lettuce from the store (and some other treats) and she gorged herself- ended up eating probably half the head of lettuce and smearing it all over her chin. It was also green leaf, as opposed to the romaine I'd been giving her previously- she'd never shown a preference for either before, and I think maybe it was the slight change of pace that perked her interest in treats again.
I know it's completely anecdotal and it may not be useful for every pig at the end of their lives, but I thought that I'd share in case it becomes relevant to your situation. You and Charlotte are in my thoughts, and I hope that her passing is as comfortable as possible.
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Can you get silver sulfadiazene cream (SSD, Silvadene, Thermazene)? A light layer on her feet may really help the redness. It's worked fantastic for some of ours.