Seems many people don't know the hazards of what you just experienced. Again, I'm so sorry. Hopefully, getting this information out there will help save others.
http://www.fondrenpetcare.com/bufo_toad.htmTo avoid attracting toads to areas where pets are, do not leave pet food in open dishes in the yard. Bufo's are attracted to dogs' watering dishes, and may sit in the rim long enough to leave enough toxin to make a dog ill. Dogs may mouth bufo toads, thus getting a large dose of the bufo's toxins, secreted from the skin and parotoid glands. Symptoms generally include profuse foamy salivation that looks like shaving cream, difficulty breathing, brick red gums, convulsions, paralysis, ventricular fibrillation, vomiting, and uncoordinated staggering. Untreated, the death rate for Bufo marinus may approach 100%(4).
Keeping your dog on a leash and well supervised when outdoors should be sufficient to prevent bufo toad toxicity. We suggest you carry a flashlight at night, so that if the dog seems overly curious about something you can check it out. These toads don't actually attack, but a curious dog sniffing or licking the toad can get poisoned as a result.
Bufo toads (actually that's redundant as bufo is latin for toad) are seen mostly during the rainy season (late May to mid October) and most often at night, near lighted areas, as they are attracted by the bugs. They are seen much less frequently during daylight hours, but can be found hiding under vegetation.
One of the ways to reduce toads in your yard is to eliminate potential food sources. Leaving uneaten pet food out in the yard can attract toads.
At Fondren Pet Care Center we see only a few cases of bufo toad toxicity each year. By educating our clients about the potential hazards we've reduced the incident of encounters with toads. The Pet Emergency Clinic sees about a half dozen cases monthly with higher rates during the rainy season.
First Aid
Immediately rinse out the pet’s mouth with a drippy wet wash cloth several times to remove any toxin from the mouth. Do not use a hose to rinse the mouth as water can easily be forced into the lungs causing more problems. Proceed to the nearest veterinary clinic or emergency clinic as time is of the essence. The smaller the pet or the larger the toad, the greater there is a risk of toxicity.