This is Season 5 episode 11 "'Eureka' is Not a Brand of Dog Food". Ruff sends Emmie and Shreya to make a hovercraft so it will help him move easier. He also sends Marco and Jay to make something that will make his life better.
This is Season 5 episode 3 "You Can't Teach an Orange Dog New Tricks". Ruff sends Marco and Shreya to learn about a mystery animal, and Rubye to learn how to make things disappear.
This is episode 6: "It's Ruff in the Ring". Ruff has accidentally been booked for a boxing match, and needs help. So he sends Shreya to learn how to box, and Marc and Marco to make protective head gear.
This is Season 5 episode 8 "How Much Frosting Can You Bear?" Shreya, Emmie, Marc, and Marco are sent to make a wedding cake for Grandma's friends' humans. Also, Rubye and Jay make a bearproof picnic basket.