I read on Facebook that using a diffuser is toxic for dogs. Is this true?

Onions can cause more damage to your dog than just bad breath. This pungent culinary favorite might add flavor to your dishes, but it contains a toxin that can cause serious complications for dogs.

Symptoms of onion toxicity in dogs If you think your dog may have eaten onions, there are a few symptoms of anemia to look out for:

• Lethargy
• Weakness
• Decreased appetite
• Pale gums
• Fainting
• Reddish *****

Treating onion toxicity in dogs The most important thing you can do, as a dog owner, to treat and prevent onion toxicity is to never allow your dog to eat onions. If your dog is suffering from toxic effects, she will probably require veterinary attention. Your veterinarian may induce vomiting, depending on how recently your dog ate the onions, and will offer supportive care until your dog's body can produce enough healthy red blood cells to replace the damaged ones. In severe cases, your dog may require a blood transfusion.

it depends which one it is
for dogs
Essential oils bad for dogs include:
Tea tree.
Cinnamon.
Citrus.
Pennyroyal.
Pine.
Sweet birch.
Wintergreen.
Ylang ylang.
and you can look here for your cats
https://www.thesprucepets.com/dangers-of-essential-oils-555089

read the bottle the stuff came in and see what the warning says if it is take yer to a vet

This artificial sweetner is approved by the FDA for intake by humans. However, for some, it may yield a host of symptoms ranging from an increase in bacterial infections to all sorts of digestive problems. The substance is added to many products as a filler or sweetener. It is a "supplement."

Vets discourage use of supplements by dogs. Is it toxic to dogs? I do not find literature saying it is toxic. That said, if your dog displayed digestive disorders after intake of this, one would think taking the dog off of it would be something to try.

Here is a list of common foods the eating of which may be detrimental to your dog and comments about one sweetener.

http://www.aspcapro.org/sites/pro/files/xylitol.pdf

People Foods to Avoid Feeding Your Pets

https://www.caninejournal.com/foods-not-to-feed-dog

Sounds dangerous with pets around.
could steep sprigs of fresh rosemary in some water. Use to spray dog, it keeps fleas away and in non toxic.
rosemary in supermarket fresh produce section.

It should be used with caution on a hound. Some breeds are overly sensitive to the ****, and can lapse into coma or die. The usual dose for heartworm is safe, 6 ug per kg body weight, but the much higher doses used for mange are likely to be toxic in certain pooches. See here

http://www.petmd.com/blogs/fullyvetted/2013/jan/toxic-ivermectin-and-safe-use-of-ivermectin-29671
.

No, it is a hoax. The popular restaurant chain does not use dog and cat meat in their food no matter what you've read on the Internet.

Raw chopped meat of any kind can be harmful to dogs and humans.

From what I read, the treats came from China and are toxic to dogs.