Welcome! Looks like a meadow rue, perhaps Thalictrum occidentale. Where in Canada do you live? Here is a link that might be useful: Link to info

I just came across this thread, if you haven't found out what it is already it's a bur cucumber, sicyos angulatus. They do grow incredibly far out and I've seen them climb to the very top of trees that are atleast 80 feet tall. Leaves can be enormous also.

Thank you for that. I think you have it right. Much appreciated.

It doesn't matter whether there's ripping or not. She probably bruised him even if there were just a couple scratches and no blood. It hurts. If it were a child he/she could have permanent emotional trauma. When my 44 pound blind 17 year old dog mistook my hand for her bone it felt like getting squeezed with pliers. A bruise and deep dent no blood. She's pretty bad now if she's making contact. Usually they start by trying to hide from the scary person and if he/she doesn't go away they will bark then charge. So you probably have seen the start of this but didn't know it was anything important. Never have a scary person approach the dog, let dog decide on his or her own if she/he is comfortable coming up to a person. If you keep your dog safe then eventually they get calmer around scary stuff. I've known this because I read everything dog I can get my hands/eyes on so have always taken even barking seriously and move my dogs away from people and situations they must bark at. Ginger, my more or less normal dog, is afraid of large dogs. She barks in their faces then bites at their hind legs. If they look at her she will run away screaming that the dog is trying to kill her. People think she has been attacked. Nope. She's having a panic attack. It's happened twice in 4 years and won't happen again. Try making a lark's head loop with the leash and put it around your wrist rather than holding the loop. Bucky gets frantic and seems to be deliberately trying to yank the leash out of my hand and he cannot if it's attached with that slip knot. Then use the other hand to regulate how much slack she gets. Only do this if she is unable to pull you over though! Bucky is only 13 pounds and cockapoos can be double that size. But better is to shut her away from the action altogether as I wrote earlier.