I found a loose stool with blood and what looks like jelly on the kitchen floor this morning - what do I do?

Acute and Chronic colitis in dogs and cats
What is Acute Colitis?
Acute colitis is a common condition in pets and is characterised by a sudden onset colonic inflammation with a diarrhoea that may contain mucous and/or fresh blood.
Clinical signs
The most common symptoms are straining when defecating, mucous (the jelly you noticed) and/or blood in the stool, and increased frequency of defecation. Systemic signs of illness are generally absent and most animals are still alert, active and have normal appetites in spite of having colitis.