Thank you for the additional information.
I am very sorry to hear that she is not feeling well. The good news is that the blue toilet water is not toxic
to dogs at all. If she would have eaten the tablet then she could have some more serious symptoms such as extreme vomiting, diarrhea, tremors, though the blue cleaner in the toilet water is diluted that most of the time only causes a mild upset stomach.
Honestly her symptoms are concerning since she is not eating and is breathing quite hard. I would be suspicious that these symptoms are due to a different disorder rather then drinking the blue toilet water. Other possibilities would be if she did eat something else toxic from the house or the yard, an organ disorder such as liver/kidney disease or even something that she ate that is currently stuck in her intestines. If her breathing continues to be hard or even labored I would recommend taking her to your vet right away to have her examined.
For now you can try some pepto bismol to help with the diarrhea and upset stomach. The dose is about 1 tablespoon or one tablet for every 30 pounds of weight. This can be given every 8 hours.
I would recommend feeding
her a bland diet to help with the diarrhea. My recommendation would be to feed some boiled ground beef or boiled chicken
breasts with cooked rice. Two parts rice to one part meat. Feed this until she is back to normal. This is very easy for her to digest and should help reduce inflammation in the stomach/intestines.
Overall if she will not eat and continues to have labored or hard breathing I would take her to your vet right away.
Hope this helps to answer your question - if not or if you have any more questions please feel free to reply by clicking on the "reply to" button. Thank you for your question!