macdack
You can think of all the things that dogs can get into at home or outdoors. My sister’s dog caught the frog the next day, put it in his mouth and kicked the frog. She made sure the frog was fine, but the dog started foaming at the mouth, saliva and all that. They were really scared and called an ambulance clinic. They said, “Oh, the toad was probably scared and urinated in the dog’s mouth. That’s what made it frothy.” I was aware of snakes, which release material that, when it enters the mouth, causes the dog’s foam in the mouth, not poisonous snakes, but worms, garter snakes or grass snakes. When dogs stop them, they sometimes foam.
Certain materials they absorb in the environment, such as dirt, will sometimes cause them to foam. You can also get what looks like sparkling, but it really is just hyper-saliva. Some dogs get more cold than usual when they get excited. I saw dogs going to the veterinary clinic. They are really nervous and have saliva strings. I have seen other dogs who think they will be fed little things and so that their salivary glands become active. They will have saliva or foam strings or blister bubbles. They get a little extra stiff as they wait for the treatment you give them.
Puppies have the worst foaming at the mouth. Many times what they get in their mouths is swallowed. Older dogs seem to have a bit more common sense. Many times they will taste what is toxic and spit it out.
Sometimes foaming at the mouth can be benign. Mostly what gets into their mouths irritates their mucous membranes. So, if your dog is foaming at the mouth, don’t think that this is a crazy rabid mental dog, it just caused what they were trying to taste or play with.