Cat Peeing Outside of Litter Box - Defcon 2

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Okay, it's not an infection and as expected it's the new labrador puppy. Unlike her predecessor, who was older and well-trained, the pup is very, very persistant and seriously pissing off (pun intended) my stray rescue who I love dearly. Their "Mexican Pee-off" stage ended when I house broke the pup. All was well for 4 weeks, then I took the pup away with the kids for a few days. When we came back, it was like the cat said, "YOU AGAIN@!" and it started all over (the cat peeing, not the puppy.) Vet said, "First (and cheapest) try Cat Attract to sprinkle in their litter." Didn't work. Defcon 2: "Nature's Miracle" cat repellant" to spray where he likes to go. Unfortunately, he moves around a bit, so I do this and also skipped to Defcon 3: "Comfort Zone or Felaway" pheramone plug-in. After that, it's a pill like Mom takes!! Any luck'/success/tricks? I've sprinkled peppermint and lemon oils (he likes the lemon - the weirdo!) I'll take any suggestions.