Disinfectants
This large range of compounds are normally used for domestic/commercial use and can include a range of products ranging from bleaches, toilet cleaners (beware animals drinking from toilets as a source of drinking water), detergents and caustics, these compounds are corrosive and contain either acids or alkalis which will destroy tissues upon contact, that in turn dissolve through the tissue membranes and are absorbed into the bloodstream which as well as causing local tissue injury will cause general illness to a variety of body systems. So depending on the substance injury can occur from a mild local irritation (many washing powder detergents to severe internal disease (pine oils and others). It is recommended to flush the affected area with plain warm water to wash the chemical away and then seek urgent veterinary attention.