Why is my dog lethargic with rashes, heavy breathing, and peeing?

This could be a sign of an allergic reaction. If she has not returned to normal I recommend Daisy get checked out by her veterinarian. Sometimes allergic reaction's require steroids other times antihistamines. If her diarrhea was a lot she could have mild dehydration as well.

This is probably an allergic reaction due to an insect bite or a plant outside. those reactions tend to resolve within 48 hours without treatment. if the swelling becomes too large or if your dog is lethargic, take her to the vet in order to get an antihistamine injection.

I'm sorry to hear about Popcorn! It would be helpful to know when he went to the vet and what injections were given. His original symptoms could indicate an allergy, and if you were at the vet recently it's possible that one of the injections could cause drowsiness as a normal side effect, if an antihistamine such as diphenhydramine was given in addition to the Cetirizine (which is an antihistamine). In that case I wouldn't be as worried. If you're still giving Cetirizine, I would recommend discontinuing and seeing if he perks up in the next 24 hours - if so, the drowsiness may have been a side effect of the medication. However, if the lethargy continues even off meds (or if he is not currently on any meds and the vet visit was more than 24 hours ago) and he's still acting lethargic, I would encourage you to take him back to the vet, as lethargy could indicate that his original rash is getting worse and he needs a change in his treatment. Hope this helps.

This is probably an allergic reaction due to an insect bite or a plant outside. those reactions tend to resolve within 48 hours without treatment. if the swelling, itchiness or vomiting do not resolve or if your dog is lethargic, take her to the vet in order to get an antihistamine injection.

Yes, it looks like an allergic reaction. I suggest you get him to your vet for an exam. In the meantime you can give him some antihistamines to see if that will reduce his symptoms. I have no idea what antihistamines you have available to you in Australia so I will refer you to this link of common ones used. ( https://www.albertnorthvetclinic.ca/antihistamine-chart.pml )

This is probably an allergic reaction due to an insect bite or a plant outside. those reactions tend to resolve within 48 hours without treatment. if the rash becomes too large or if your dog is lethargic, take Louie to the vet in order to get an antihistamine injection.

This is probably an allergic reaction due to an insect bite or a plant outside. those reactions tend to resolve within 48 hours without treatment. if the itchiness becomes too severe or if your dog is lethargic, take Chico to the vet in order to get an antihistamine or steroid injection which will stop the allergic reaction.