I dont mean to sound alarmist here but this sounds all too familiar to me.
My previously healthy boar, Charcoal, began to lose weight over some months.
I went to my vet and they said he is ok, no problems and he will be ok.
He carried on losing weight and so I went back to the same practice but saw another vet.
Again they said there is nothing wrong, he'll be ok.
After seeing his weight drop by around 100g I took him to a completely different vet practice.
They too said that nothing was wrong and that he will be ok.
After another month or so he was still losing weight but also looking depressed, so I took him back to the original vet practice but saw the head vet.
He looked at his back teeth and said that they were ever so slightly long and sharp and kept him in to 'make him woozy' (not asleep but unaware) and rasped his teeth.
We took him home and fed him critical care, which he lapped up and he began eating again and even seemed to perk up a little bit.
We went in to check him on Thursday morning and he was wobbly on his feet and looked really tired.
I made an appointment with the vet that evening.
I spent the last hour before the appointment with him cuddled into a warm blanket (he was cold feeling) and I could see that he was nearing the end of his life....so we kept cuddling.
He was still alive when the appointment came around and the vet weighed him (as he wobbled away on the scales) and he had lost 100g in the matter of a few days, despite us seeing him eat and also syringe feeding him.
She said that she didnt know what else to do, she would take blood etc but as he had no fat on him (didnt even have any muscle mass) that she wasnt comfy doing this.
I told her that I know what needs to happen, he is going to be dead within hours anyway, will she please help him to pass with dignity.
We cuddled him whilst she got the things ready and then he was put under anaestetic and then injected and put to sleep (he was gone within seconds).
So I lost my first ever guinea pig and the light of my life.
The point is that I felt for months that they should do bloods or x-rays or something, but I trusted their opinion and didnt push it...all the time knowing in my heart that they should do more, but who was I to push the point with a professional (or four!).
PLEASE...tell your friend to tell the vets to take some bloods and do further tests on him, losing half of their body weight isnt normal and shouldnt be just explained away as 'it could be its teeth'.
Yes ok, it could be, but PLEASE force them to investigate more deeply.
At the end of the day I dont feel that anything would have helped Charcoal, I think that something was just not working inside of him and it was his time to go, but I will always wish that Id pushed more for further investigation and I dont ever want anybody to feel the way I do.
Yes I'm happy that any suffering that he felt has ended and I dont regret the decision to send him on his way, but I DO regret not standing up to the vets, shouting that I knew MY boy and MY feelings on the subject counted too and that I wasnt just being an over fussy owner, which I think thats what they saw me as.
Please ask your friend to kick and scream if she needs to, but dont be satisfied with 'maybe's, 'could be's and 'perhaps's...the vets cant always be right first time and sometimes they NEED to be pushed.
I hope that your friends piggy is fine and gets well soon.
Keep us informed.
xx Steph xx