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Weight loss underweight unknown cause

Lilcooppig

New Born Pup
Joined
Mar 16, 2025
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Location
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Hi guys. I’ve used this forum for lots of things since bringing my piggies home but never posted. Sorry it’s going to be a long post!

I’m worried about my pig Merry. I have 2x sows Merry and Pippin, presumably from the same litter. They were the same size, same colouring, and together in the same pen when we bought them.


Pippin has always been the more vocal one, and although does not like being picked up (runs away) once she is having a cuddle she will happily sit with the kids and let them hand feed her, as long as the food keeps coming she will sit still.

Merry doesn’t stay still. She freezes when my hand goes in the hutch like she’s frightened so although picking her up is easier than Pippin, she definitely does not feel comfortable being handled, and once she’s out she’s constantly looking for a way to escape. She is very reluctant to accept food from a human hand.


Because of this, I purchased an open floor pen, which I let them both run around in and the kids can sit on the floor and watch, hand feed pippin, and occasionally stroke Merry without needing to handle her. She seemed much more content with this set up. The hutch has a door that opens downwards like a ramp so I tend to open that into the pen to allow Merry to walk down it cutting out the need for the kids to handle her as much as possible, I just wanted her to be comfortable and feel safe.

The hutch is 2 floors, with a door that closes off the access. I open the top doors, coax them both down the ramp, close it off, then clean the top. Once it’s all clean and ready, I open the door, coax them both back up the ramp, close the door again, and clean the bottom. Open the door to give them full access once it’s all clean. This means I have not physically handled Merry for a while (Pippin still comes out for cuddles).


They get hay and dried ‘kibble’ style pellets, fresh salad (lettuce, rocket, spinach, carrots, bell peppers, cucumber etc etc) every single day. I also give fresh grass when I can find them, dandelions.


Merry is long haired and mostly white and the other day I noticed hundreds of black spots covering her fur. Google said hay mites so I purchased some shampoo and conditioner, and a spray for their bedding. It all arrived and I prepped everything to get ready to wash her, however upon picking her up I realised she was EXTREMELY light and I could feel her bones. Weighed her and she’s only 535g!!! I have never weighed her before, the food I give is always eaten and they are very active, I never thought there was a problem. I have no idea how long she has been losing weight, she didn’t LOOK skinny but I guess that’s the long fur covering her up. I’ve weighed pippin and she was 774g which Google says is still really small except she feels really fat, not just compared to Merry, she’s a happy little piggy and constantly eats.



To try and help out Merry I have trimmed most of her fur back to reduce her drying time, I’ve washed her, put her in am open box near the radiator with lots of towels and food etc so she could dry out however she barely touched the food and just snuggled into the towels. Before putting her back in the hutch I tried to hand feed (never had any success before) and she actually ate several bites from the carrot, some leaves, and a few bits of kibble!

I’ve tried to handle her a little bit the last few days and tried to hand feed again, but she doesn’t want to take it. Once she goes in the hutch I see her eating, and she’s always the first one to run to the bottom section when I top up the kibble. I see her often at the water bottle drinking too. However I’ve weighed her this morning and she’s lost 2g. I’m just really worried, and feel awful for not noticing her weight loss until this point.


I’m just after some advice really. I avoided handling as I felt she really did not like it but now I’m wondering if I should keep trying with the hand feeding? Should I separate the piggies for a bit to see if Pippin is eating too much? Looking how much of a chunk she is it was my first thought but with her being ‘underweight’ too should they BOTH be fed more? There is a constant supply of a variety of food available to them, and often when cleaning the hutch I find uneaten food which I feel if they were starving they wouldn’t ever leave anything?

Their nails and teeth seem fine, they have plenty of toys and wooden things to chew on. Plenty of wet patches of sawdust and thousands of poops every day so I know they are eating but I’m just at a loss.


No specialist vet near me, and the shop I got them from is useless (it’s a chain, staffed by teenagers just needing an easy job and they have absolutely no idea about the animals they sell)


Sorry, thank you for reading this far ❤️
 
I'm sorry to hear this.

How old are they?
How long have you had them?

Please do see a vet. It doesn’t have to be a specialist but she should be checked by a vet.

Re mites. If they have a diagnosed case of mites, then they need a proper treatment of ivermectin dosed for their weights and carried out as part of a complete course.
Shampoo and conditioner will do nothing to help.
What was the spray for the bedding your purchased? Unless it is F10 disinfectant (which is fine) we would not recommend you use any pet shop sprays or pet shop parasite products. They are too low dosed to help.

Please do not separate them. That will cause them a lot of stress. It also won’t make any difference to monitoring hay intake (hay being the main part of their daily food needs).

Regular, weekly weight checks are the only way to gauge hay intake. Piggies lose weight when they don’t eat enough hay.
Now there are health concerns, please weigh them daily, each morning so you can monitor hay intake. Weight loss is only considered weight loss when it hits 50g (anything up to that is simply normal fluctuation - full/empty bladder) however as you don’t know what her weight was and given she is at a tiny 500g weight, she cannot afford to lose any more so I would suggest you step in with top up feeding now and monitor her daily so you can ensure her weight remains stable.
You need to find out whether she has health issues so seeing the vet is still essential.
Please do come back to us with her daily weight checks and we can help guide you.

Please also check their heft (the weight management guide below explains how). The number on the scales is not the way to gauge whether they are healthy for themselves - checking the heft is.
Piggies can be small and have seemingly low weights but be perfectly healthy. 775g is small but is not necessarily abnormally small for an adult as long as she is maintaining her weight.
Average weights can be 600-1600g and still be healthy within that.

I would also suggest you review the veg part of their diet - rocket, spinach and carrots cannot be fed every day. Spinach is too high in calcium and carrots are too high in sugar. Spinach can be given just a couple of leaves each and no more than once a week. Carrots are a tiny amount as an occasional treat.
They need unlimited amounts of hay, one cup of veg each and one tablespoon of pellets each. They should not have constant access to pellets. Too many pellets can cause lack of hay intake and thus lead to health issues.
Please do not suddenly start overfeeding veg and pellets thinking it is the way to stabilise their weight (it isn’t) as it will have an adverse effect on gut health.
They need unlimited amounts of hay but to be syringe fed if they are losing weight

I’ve added lots of guides in below to help you with further information but please do ask us questions.

New Guinea Pig Problems: Sexing & Pregnancy; URI, Ringworm & Parasites; Vet Checks & Customer Rights

Long Term Balanced General And Special Needs Guinea Pig Diets

Health monitoring and pain assessment
Weight Monitoring and Management
Weight Loss Explained: BMI, Weighing, Poos and Feeding Support
Signs of Pain

Acute crisis, post-op care and heat strokes
Emergency Resources and Critical Illness Care - Contents list and subforum link

Emergency, Crisis and Bridging Care until a Vet Appointment
All About Syringe Feeding and Medicating Guinea Pigs with Videos and Pictures
How to Improvise Feeding Support in an Emergency
 
Thank you for your reply, I was a bit frantic this morning after weighing her again.



apologies for confusion, for clarification I don’t feed them all of those things every day (except hay, grass and pellets) but every day they have SOMETHING if you get what I mean, just something a little extra. A few chunks of cucumber, or half a carrot, or some spinach, or some lettuce, broccoli, pepper. So not all of those things every single day? If that makes sense.


The shampoo, conditioner, and bedding spray came together in a set, the brand is ‘farriers’ (attatched a photo) and said it was for hay mites.


Thank you for saying about separating them as I was hoping I wouldn’t have to. They are very close and as I said, I believe from the same litter so they have always been together, are always cuddled up together and Pippin although is happy enough having cuddles and being fed, does get very vocal as if she’s calling for Merry when she’s out of the hutch. That’s why the open pen was ideal as they could still be together, the kids could still interact, but Merry didn’t have to be handled.

We bought them in August last year so we’ve had them for 7 months, and I assume they were maybe a few months old when purchased so possibly around a year old now?

I will reach out to the local vet (the one we take the dogs to) and see if they can help although in the past I know their signage only lists prices for larger pets, nothing about piggies, etc etc. I took my hamster there around 8 years ago and they said they couldn’t help with anything that small, hopefully it’s different now.

If not I will look for a small animal vet in the city.


Thank you for your advice. I have also bought a different brand of hay today so I’ll see how that goes. I’ve also bought vitamin drops to add to their water. Not sure if it’s actually any benefit when they have a good diet already but worth a shot
 

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Please do not add vitamin drops (or anything ever) to the water.
This is for a few reasons:
- Unnecessary supplementation of vit c can actually be detrimental to their health and if given long term it can actually cause scurvy
- vit c over and above their needs is simply excreted in the urine so what they drink may simply come straight back out
- adding anything to water can promote algae growth
- you cannot control the dosage they are getting
- it changes the taste of the water and can stop them drinking entirely thus risking dehydration

Please do not use the farriers product. It is entirely wrong, and from what I can see doesn’t contain the correct active ingredient (ivermectin). It also contains essential oils which can cause health issues for piggies, and is likely to be too strong a smell for piggies sensitive airways (it is never a good idea to use anything scented (perfume, candles, air fresheners, essential oils etc) around piggies
 
Okidokie that’s great advice. I assumed it would probably we weed straight back out again as human multivitamins are essentially the same! So I won’t bother with that.


I’ve only used the shampoo once so again, won’t bother using that any more.

I’ll seek out a vet that can prescribe ivermectin.

Thank you ❤️
 
I'm sorry to hear your poor piggy is not well, she really does need to see a piggy savvy vet. I am linking the recommended vet list in case there is a vet someone has recommended near you.

Recommended Guinea Pig Vets
Thank you for this!

I have weighed her again today and she’s lost another 20g so I’ve booked her in with the vet I found on your list, on Friday
 
Definitely a good idea to have her checked.
As I said above, while 6g in 6 days is not considered weight loss, she is too small to be on a downward trend. Step in with some support feeding to ensure she doesn’t lose weight

I hope she is ok
 
Definitely a good idea to have her checked.
As I said above, while 6g in 6 days is not considered weight loss, she is too small to be on a downward trend. Step in with some support feeding to ensure she doesn’t lose weight

I hope she is ok
Vet saw her today, he said it’s her kidneys and there’s nothing they can do unfortunately. Told me to keep an eye and regularly weigh Pippin too as kidney problems can run in their genetics and as we believe they are from the same litter then it’s likely she will develop problems too.

Suggested lots of ‘wet’ food such as fresh grass and cucumber to help with Merry’s water intake as he said she will likely lose too much energy to want to reach up to her water bottle. Also suggested to put a bowl of water down so she has a choice and doesn’t have to rise up to it but basically said she’s pain free and it will be a quick decline so she won’t suffer.

Just got to make sure she’s happy and feels loved for the time she has left 💔❤️
 
I'm so sorry there is nothing thing that can be done but at least she is not in pain and as you say you can make all her days count 💗
Still upsetting for you though so take some time to process it 💐
 
Just for anyone curious, weighed both pippin and merry this morning and they are 785g and 540g. So both have put on a little weight. I know it’s likely just part of the fluctuation but it’s nice to see the number go up for once. They had lots and lots of fresh grass yesterday and half a cucumber (very said merry needed the high water content and it wouldn’t harm pippin if her kidneys are most likely poor too)

I’ll keep going with the weigh-in’s. I’ve watched the video on syringe feeding but atm Merry is very happy munching on what she has and I see her drinking too so hopefully I won’t need to do that yet.

Thank you for your help
 
I think if you can ween them onto it freshly growing grass is beneficial for any guinea 💐
 
I think if you can ween them onto it freshly growing grass is beneficial for any guinea 💐
Yeah I think I’m going to give more grass than I normally do as they wolfed it down yesterday. Keep up with cucumber too and I’ve got some iceburg lettuce as well as that’s got a high water content. Merry was down to 523g when the vet weighed her so for her to be 540g this morning it was very good to see. Thank you for your help
 
I don't think they should have Iceberg lettuce if I remember correctly 🤔
 
To increase water content some members rinse all veg before giving it to their guineas so it's coated in water as such 💐
 
I’m sorry to hear this.

The amount of water consumed if veg is rinsed and fed wet is negligible - most just runs straight off. You are better off to give some cucumber or fresh grass than rinse veg in water in terms of additional water intake.

You do just want to be a bit careful about too much of a sudden increase to a very wet diet as this can lead to diarrhea, and diarrhea can then be a dehydration risk.
Diarrhea is the reason iceberg lettuce shouldn’t be fed as it is a higher water content.
 
Hi guys Merry passed last night. She became very lethargic and cuddled herself into the corner of their bedroom on the top floor of the hutch like the vet said would likely happen, and she barely moved for 2 days so we were offering food directly next to where she was and out a bowl of water down so she didn’t have to move. Last night we checked and she was in the bottom of the hutch and playing with Pippin which was lovely to see. She seemed happy and was chirping away. Checked before I went to sleep and they were both back up the top cuddled in together in the corner of the bedroom and that’s exactly how I found them this morning but unfortunately Merry had crossed over.

I’m glad it wasn’t long and drawn out, I’m glad she had a chance to play with her sister again and that they had lots of snuggles.

Sad outcome but thought you might want the update.


I’m going to continue with weighing pippin to keep an eye as the vet said it’s likely in her genetics.
 
I am so sorry Merry left for The Rainbow Bridge 🌈 it sounds as if she had (please don't take this the wrong way) a beautiful final day in this life before crossing. To be surrounded by those who love her and to have her sister right beside her must have reassured her.
Popcorn happily over The Rainbow Bridge dear Merry 🌈
 
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