The term 'POOCH PEST' is a combination of two words, 'POOCH' and 'PEST'. The first word, 'POOCH', is a slang term for a dog, while the second word, 'PEST', refers to an annoying or troublesome creature. The crossword solution for this term is 'FLEA', which is a small, wingless insect that feeds on the blood of mammals, including dogs. Fleas are a common problem for pet owners, as they can cause skin irritation and transmit diseases.