Regular veterinary care is a must for all pets. Even though nothing seems wrong, your pets should see the vet yearly for a routine checkup. The same applies to guinea pigs, as they are susceptible to certain diseases, even if you keep them indoors.
Rabbits, cats, and dogs may have a bacterium called Bordetella bronchiseptica and can pass it on to guinea pigs in their proximity. It infects their respiratory tracts and can be fatal to guinea pigs if it progresses into pneumonia. Fly strike is another condition that can be fatal to guinea pigs if not treated early. It occurs when blowflies lay their eggs on guinea pigs, usually near their genitalia, and when the eggs hatch, the larvae eat the guinea pig’s flesh. Aside from these illnesses, guinea pigs can also suffer diarrhoea, scurvy (vitamin C deficiency since guinea pigs cannot make it themselves), tumours, abscesses because of infection, urinary problems, and infestations by lice, mites, or fungi.