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Adopted Boar rapidly losing weight

JuneMapleWillow

Junior Guinea Pig
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Jul 27, 2025
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Bristol, Bristol, City of, United Kingdom
Hi, I'm looking for any kind of advice.

3 weeks ago we adopted a newly castrated boar from an rspca rescue centre. He had been surrendered by a family who could no longer care for him, he was then castrated and fostered by another family before being adopted by us. His estimated age was said to be 4yo.

To say we were disappointed was an understatement. At first meet we noticed he was incredibly skinny, weepy eyed and (I wish I had taken a photo, I'd never seen anything like it) his nails were 3x the length they should be. It was like he was walking on high heels, it was horrendous. The very first thing I did when I got him home was cut them as far as I could, I have cut them again yesterday to a normal length.

They told us when he was castrated (June 24th) he weighed ~900 grams and had a healthy appetite/teeth etc. As of last night he weighs 630g and we are trying last measures to stabilise his weight or he will sadly be put to sleep. We have weighed him every day, his weight has stopped dropping but it's not improving. He was losing 30g a day for a week or so, but still he is very active and curious and pretty friendly.

Because he was adopted through rspca, we have taken him to their vet twice for free. The first vet said there was basically nothing wrong with him and asked me if his weepy eyes were normal, when I said no she didn't even bring it up again. She gave him a gut stimulant, I don't know the name of the drug but it was injected. The second vet recognised he was seriously unwell and offered an x ray but said they're a charity and there's not much more they can do, which I understand. His x ray revealed slight arthritis in his hip but nothing else. He's had his teeth checked but only by the first vet and she identified no problems. They were also checked as part of his pre op. He will only eat leafy greens, sometimes hay and critical care, he won't eat anything remotely hard. Watching him trying to eat is awful, he will make weak attempts to bite at things but ultimately give up. His front teeth look normal though. We've been spoon/syringe feeding him critical care but it doesn't seem to be doing much. Any fruit / veg left in his cage will not be touched

He doesn't have much of an appetite, he will eat little amounts often but nothing aside from that. He drinks quite a lot of water, so I'm concerned it could be something like diabetes. We've tried him on baytril (?) in case there's some kind of infection, which might be what has stabilised his weight but who knows. He is also on metacam for any pain he might be in. He's barely passed any poop, and when he has it's been misshapen and small. He's had the occasional normal looking one though.

We have 6 girls which he has been living next to, and he has interacted with them a little bit through the bars. He doesn't seem stressed at all by them or I would have removed him.

I think that is everything, so yeah we are on week 3 and still at a loss. He's a lovely boy so it would be a shame to see him go, but 630g is an extremely low weight and I can't allow him to drop anymore than that-- it wouldn't be fair on him.

Our first experience adopting from a rescue centre instead of private rescues and it's been awful :(

Thank you.
 
IMG-9286.jpg
This is the current set up with him in the top left. Obviously the plan was for him to be in the enclosure with them eventually but for now he's in the ferplast cage :(

I don't know if it would be more ideal for him to be indoors to eradicate any issues ? I have no idea. Like i said I need advice xD
 
I’m so sorry to hear this and that he was in this condition from the rspca.

How much critical care are you getting into him each day?
He will need at least 60ml per day to attempt to stop weight loss, could be as much as 100ml per day. 40ml is the absolute minimum to keep a piggy alive.

I don’t see any hay in his cage in the picture - do add loads of it to try to encourage him to have a nibble. Hay is best in loose piles or in trays rather than in racks or restrictive containers.

Have you tried offering him thin strips of veg cut into match sticks? That can sometimes help.

Otherwise I would suggest the most important thing is to find a more knowledgeable vet?
At the very least he should be on gut stimulants daily (one injection wouldn’t be enough).

How long was he on baytril?
Is he still on pain meds? If so, what dosage and is it twice a day?

I would personally not move him indoors if that means he then doesn’t have piggies next to him for communication.

Weight and Weight Loss Explained: BMI, Weighing, Poos and Feeding Support
All About Syringe Feeding and Medicating Guinea Pigs with Videos and Pictures
 
Sending healing wishes to your boy how awful for you both.
So have his back teeth been checked if he is struggling to eat? 💐
 
I’m so sorry to hear this and that he was in this condition from the rspca.

How much critical care are you getting into him each day?
He will need at least 60ml per day to attempt to stop weight loss, could be as much as 100ml per day. 40ml is the absolute minimum to keep a piggy alive.

I don’t see any hay in his cage in the picture - do add loads of it to try to encourage him to have a nibble. Hay is best in loose piles or in trays rather than in racks or restrictive containers.

Have you tried offering him thin strips of veg cut into match sticks? That can sometimes help.

Otherwise I would suggest the most important thing is to find a more knowledgeable vet?
At the very least he should be on gut stimulants daily (one injection wouldn’t be enough).

How long was he on baytril?
Is he still on pain meds? If so, what dosage and is it twice a day?

I would personally not move him indoors if that means he then doesn’t have piggies next to him for communication.

Weight and Weight Loss Explained: BMI, Weighing, Poos and Feeding Support
All About Syringe Feeding and Medicating Guinea Pigs with Videos and Pictures

It's hard to measure due to him sometimes eating it off the spoon and spitting it up, I'd say he's probably having about 40ml right now. But eventually he just spits it up and won't take more. I'm gonna try again in a moment with him, just giving him time between feedings to rest and chill.

Yeah this was taken this morning first thing, he has hay in the little grey area and he is sat on the pile I gave him last night in the photo. He was interested in the girls so I tried to pull some through to encourage him seeing them through the cage. I gave him enough to burrow in a couple hours ago so hopefully he's had some.

The matchsticks idea is a good one! I will give that a go, might as well. But he just has very little appetite.

We plan to see an exotics specialist in the week and just pay ourselves for the appointment. He is on baytril since I wanna say Tuesday? 2x a day 0.2ml

Loxicom pain relief but it's measured with the cat kg syringe, so he's on 1.5kg cat dose. Whatever that is
 
Get as much syringe feed into him in each 24 hour period as you can - thats all you can do at present - little and often.
40ml is the bare minimum to keep them alive but it won’t necessarily be enough to stop weight loss and certainly not enough for weight gain.
You then use daily (each morning) weight checks to manage and adjust syringe feeds for the coming day.
It is much easier to use a syringe if you can - it also enables you to keep track of quantities.

Normally vets will not give the cat measuring syringe and will instead give you a 1ml syringe and consequently a dosage in ml.
Piggies have faster metabolisms and painkillers don’t damage their kidneys in the way it can do to cats. So piggies tend to have a higher dosage for body weight than cats do. Piggies also tend to need their pain meds twice a day to keep up with the faster metabolism.

I’m glad you can get to an exotic vet. He really could do with some gut stimulants as well.
 
I can give that a look, but I actually have hopefully good news?

He is seeing an exotics specialist tomorrow morning, free of charge. He has also had 17ml of critical care through syringe and more on his own straight from a bowl at around 4pm, and has had about 15ml on two further occasions this evening/night and has also eaten some leafy greens. His weight today has held steady at 630g and hopefully tomorrow it'll have gone up- I'll keep this updated with what the vet says too.

We are highly suspecting now that it is something orally wrong rather than at all or entirely digestive, observing him eating has shown some worrying signs and we think maybe the previous vets didn't know what they were looking at when it came to his teeth/mouth.

Thank you all for your help
 
Hi there. I just want to say, don’t lose hope. My 7 year old Finn went through a period of decline in April - he was 680g at one point. I thought I was going to lose him. His arthritis seemed to get worse and he seemed to be giving up. (He was already on pain meds prescribed by an exotic vet.) He surprised me and started to improve. I then sadly lost my soul pig Wilbur early May meaning that Finn got Wilbur’s friend and they are so happy now. Finn is back to nearly 900g. He’s very active and doing better than his 5 year old friend!
 
Ah thank goodness you have him to give him a chance
You’ve had lots of excellent advice from @Piggies&buns
I hope he has put some weight on and that the exotic vet can help him ❤️
Sending healing vibes to the little pig 🥰
 
From what you have said, it certainly does sound like there is a chance of it being a dental issue.

Let us know how you get on at the vet
 
Hi everyone, sadly not a good update.

He was put to sleep yesterday evening. I'm writing this now because I've calmed down a bit, I'm going to try to stay respectful but I am really angry and disappointed in how this whole thing turned out.

Yesterday he was taken to the rspca vet because they wanted to see him again to investigate this, his back teeth were declared fine once again. So, fourth time, fourth vet. He was then put under anaesthetic I believe in order to do an xray of his mouth/jaw and to investigate, he reacted badly to this and was sent to the exotics specialist vet. When he arrived, the exotics vet said STRAIGHT AWAY that he had SEVERE dental disease and never should've been up for adoption in his condition. He never should've been cleared for his pre-op for castration either. Anybody with the smallest understanding of guinea pigs would know that it was a recipe for disaster.

It seems like his original owners fed him a terrible diet, he never went outside, never saw other guinea pigs. He was neglected by them, then neglected by the rspca and also neglected by his foster home. I appreciate the RSPCA is a charity and they do the best they can, and the foster home may not have recognised the dental issues like we did, but even something as simple as cutting his nails was never done. I really wish I had taken a photo of that, I can't stress enough just how bad it was.

His last full day was Sunday, which he spent in sunshine. I had allowed him to go out on the grass and hang out with my sows which I hope he enjoyed as much as he could in his condition. He was a super inquisitive piggy, he spent the whole time just investigating the enclosure and wondering who all these strange women were.

Rest in peace Piggie, I'm so sorry everyone failed you. At least you're not in pain now. I'll never forget you <3

Thanks everyone for your help. I really really appreciate it, I fully believe there's nothing more we could've done to help him and we gave him the best shot we could've. Sadly this just came down to negligence from the people who are supposed to know what they're doing. I hope this doesn't happen again but I know it will, it drives me mad that guinea pigs are so misunderstood and mistreated when they are sold in pet shops everywhere (at least here in the UK). Thank you all again, this has opened my eyes a lot.
 

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I am so heartbroken to read this and we are sending you a huge hug. In time the issues you've faced probably do need addressing but for now you need to be gentle with yourself in the knowledge in his days with you he was loved popcorn happily over The Rainbow Bridge buddy🌈
 
This is really heartbreaking. I am so very sorry. Sleep tight little piggy :(
 
I’m so sorry, what an ordeal for you ❤️ thank you for giving him the best chance and happy last days, and then letting him go peacefully when it was his time
 
Oh no I’m so sad to read this - you knew all along - both of you were failed
Take care of yourself and know that you did the best for that little piggy that you could
He is popcorning freely at RB
 
I’m so sorry. Popcorn high over the bridge gorgeous boy.
 
So sorry to hear what’s happened.
Sending you a big virtual hug 🥰.

Sounds like you gave your boy a lot of love for the short while he was with you. 💙

Rest in peace sweet Piggie. 🌈
 
I’m so sorry to hear this. You showed him such love and care
Sleep tight sweet boy.
 
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