Q:

Could someone please identify this plant?

I need help identifying this plant, it may have made my dog sick. 

A:

After some super input from 'someone else', we should consider Arctium lappa or Common Burdock.  These leaves in the picture are of a plant without fertilizer and only periodic watering.  Burdock leaves can get huge with lots of water and a bit of fertilizer!  Look at the margins, overall shape, color and if we were to pull that plant out of there we could see that root.  
If this answer is correct, then I doubt this caused the puppies any sickness. I'd like to hear what the symptoms of those puppies were?  What the veterinarians have found.  Please say they are fine now, those puppies or puppy is still fine?!

