A couch can soak up puppy smell fast. This post shares what helps: a washable throw, paw and coat wipes, washing the cover often, and teaching an 'off' cue if you want the couch dog-free. It's from Love My Puppy. Strong odor from the puppy itself can be worth a vet visit. https://lovemypuppystore.blogmazing.com/42176245/a-stinky-puppy-and-a-clean-couch-what-i-wish-i-knew-sooner