Can guinea pig urine harm you just from the smell?

It's unlikely that the smell of guinea pig urine alone would harm you. However, there are a few things to consider:

* Allergens: Guinea pig urine can contain allergens that trigger allergic reactions in some people. These reactions could manifest as skin irritation, sneezing, runny nose, or even asthma.

* Ammonia: Guinea pig urine contains ammonia, which can be irritating to the respiratory system in high concentrations. However, the amount of ammonia released from a typical guinea pig cage is unlikely to pose a serious health risk.

* Bacteria: Guinea pig urine can also harbor bacteria, though not necessarily harmful ones. If you are exposed to a large amount of urine, you could potentially develop an infection if you have a cut or open wound.

Overall, while the smell of guinea pig urine itself is unlikely to be harmful, it's still a good idea to maintain good hygiene practices and keep the cage clean to minimize exposure to allergens, ammonia, and bacteria.

If you are concerned about the smell of guinea pig urine or experience any symptoms after exposure, it's best to consult a doctor or allergist.