If you notice your cat's eyes turning more watery than usual and you see other unusual symptoms, be prepared for treatment. (tinpaw.com)
You should also call your vet or, out of hours, your nearest Vets Now, straight away if your pet has a limp and is exhibiting other unusual symptoms, such as sickness, diarrhoea, fever, loss of appetite, excessive panting or lethargy. (vets-now.com)
If you've tried all the methods above and they're not working, if your child has any other unusual symptoms (such as a fever), or if the diarrhea has been going on for some time, then you should see your child's pediatrician, who can do stool cultures to check for parasites and bacterial infections. (verywellfamily.com)