Pecans also contain the toxin juglone that can cause laminitis in horses. Feeding dogs pecans can cause gastric intestinal upset or an obstruction. Like walnuts, moldy pecans can contain tremorgenic mycotoxins which can cause seizures or neurological symptoms.Click to see full answer. Also know, what nuts are poisonous to dogs?Nuts that are okay for dogs to eat include peanuts, almonds and cashews. As with any new foods, caution should be exercised: according to the ASPCA, the high fat content in nuts can cause vomiting and diarrhea in dogs. Dog owners should not feed their pups macadamia nuts or black walnuts, as both can cause problems.Beside above, are pistachios bad for dogs? While pistachios have certain health benefits and are ultimately not toxic to dogs, their high fat content could make them pretty sick if they have them in large amounts. Pistachios are a tasty snack— for humans. Ultimately, feeding your dog pistachios is not recommended. Furthermore, will one walnut hurt my dog? Walnuts are bad for dogs too. According to Nationwide Pet Insurance, walnut poisoning is one of the most common claims for toxic ingestion. The average cost to treat walnut poisoning is $419.Are pecans good for you?Pecan nuts in fact rank among the top 15 foods with the highest levels of antioxidants according to the USDA. They are also a powerhouse of vitamins and minerals such as manganese, potassium, calcium, iron, magnesium, zinc, and selenium, offering some wonderful health benefits.