UTI or something else

Question
Good evening
My guinea pig is a male 5 years old. Until this year he was very healthy and very strong.
He had a surgery for breast cancer back in May.Everything went well.
Then he had some kind of eye injury at the same time his upper teeth broke.
One of them grows back, the other no. We took him to the vet very often.
The doctor could not explain what is going on with his teeth. They said they never saw something like that.
And now something else. He has blood in his urine.
He took antibiotics baytril for two weeks and he still has blood in urine.
The dr continued the treatment for another two weeks.
He is very active, but he lost weight that he is not putting back despite eating and pooping
Very, very much. He is now 1160 g.
We took x-rays and he doesn't seem to have stones.
He is crying when he pees sometimes.
We love him very much, and we would like to have some other opinion.
Is this UTI? Something is wrong with teeth breaking as well...
What can we do to help our little guy?
Highly appreciate your help,
Thank you,
Carmen

Answer
The teeth typically get broken either by chewing on the bars of the cage or being dropped and bumping the mouth. He is an old boy by cavy standards, so he may be experiencing some of the problems of old age.

If he's crying when he urinates he's telling you he has pain. If he has bladder stones that's very painful, but an ordinary urinary tract infection can be painful as well. If he's not responding to the antibiotics I would suspect it's more likely a stone and antibiotics aren't going to help that.

I can't explain why he keeps breaking his teeth either. It's unusual and makes us wonder if there is a calcium issue going on. Because of his advancing age finding a diagnosis is more difficult.

Many pigs begin to lose weight as they advance in age. We call it a 'wasting syndrome' and simply put is an indicator that they're bodies are no longer working or digesting like they should. It's often an indication of their time to leave us soon.

I wish I had something more positive to offer. I'm afraid this is something that you and your vet need to follow closely. He may just be telling you his time is coming to a close. He's been a happy and healthy pig for five years and that's a tribute to your good care. Unfortunately things like this don't go on forever so we just pray for a peaceful and painless end when the time comes.