I know you guys in different climates have different toads, but we in South Florida have Bufo toads
(aka Cane toads) that are extremely toxic to dogs and cats. Among my grooming shop clientel I bet we lose 4-5 dogs a year, and these are well cared for indoor dogs who just snatched one up for a few seconds without the owner realizing. If you see it happen you just rush the animal to a hose or faucet and rinse the inside of his mouth really well, and they are usually OK. Smaller dogs are more at risk and need emergency veterinary treatment asap. But newcomers to the area often haven't heard about them and don't know what to do- they are a horror.
And they are huge, too- they get over 2 pounds and are large enough to eat birds. Whe we installed our new fencing years ago we buried wire mesh several inches underground all the way around to help keep them out of the yard. That was a difficult and time consuming chore but it did the trick- previous to that if you looked out in the middle of the night you could see 25 of them just sitting there.
I know toads eat insects and many folks love them, but I kill these on sight. As I see it they are lying in wait to murder one of my dogs, and it is 100% "justifable toadicide".