Ibuprofen also for dogs is really dangerous.Unfortunately, cannabis isn't universally benign. Like humans, the only way it can kill cats, is if someone drops a kilo brick from an aeroplane and it hits us. Dogs however, get really bad loss of balance and vomiting from one component: cannabichromene. It can cause such bad vomiting that their electrolyte levels become dangerous.
Never give an animal a medicine you think is safe, because it's safe fir humans. We all have differeing biochemistries. Paracetamol is hideously toxic to most mammals. Humans, along with guinea pigs are the only mammals that can't make vitamin C and need it in their diet (my ex started as a vet nurse, before a degree and becoming a toxicologist.)
Itโs quite hard to poison cats but they will drink from water with antifreeze in it. My cat was recently intentionally poisoned this way. Didnโt end well, we had to euthanise her even though I caught it early. Administered ethanol and pushed fluids but was too late by then, put her to sleep before she started badly deteriorating.
CBD is good for dogs though, can help with lots of issues.
I'm so sorry
). I did run some past a friend who's a consultant pathologist, who I think got a bit concerned at my lines of enquiry (I told her my ex was writing a novel. Not a lie, only my ex was writing a vampire novel). I won! If you're wondering how, all I will say is, "have you had the stern lecture about only carrying Dewar flasks of liquid nitrogen up stairs?" 
