Dogs And Onions Symptoms. If your dog’s eaten onions, they could show signs of illness within a day, but sometimes it takes several days for the signs of anaemia to become apparent. These signs usually appear a few days after your dog eats onions, so if you know your dog ate a toxic amount of onions, don’t wait this long to go to the vet.

You might not realize that your dog is eating onion or garlic in certain snacks or table scraps. This is then followed by the effects of the red blood cells being damaged and dying. Does your fur baby displays any signs of smell of onions or %%symtom2l%% or not looking well?