Chips and Dip
One of the more popular summer dips, guacamole, is also one of the most dangerous for pets. The three main ingredients are all dangerous in their own right: avocado, garlic and onion. Onions and garlic can cause gastrointestinal issues, elevated heart rate, and red blood cell damage. Avocado toxicity, while not considered as toxic to dogs and cats as it is to birds, can sometimes lead to vomiting, diarrhea, and lack of stool production.
Chips can be a danger, too. Large amounts of salty foods can produce excessive thirst and urination, or even sodium ion poisoning. Signs include vomiting, diarrhea, depression, tremors, elevated body temperature, seizures, and even death.