Furbo's Clones were countless clones of Furbo that he created while he was feeling hyperactive. They debuted in Animal Attraction.
After Max and Steel spent all the night trying find where Extroyer was, Steel forgot to activate Furbo's sleep mode. The dog became hyperactive and replicated himself with N-Tek's replicator and created lots and lots of clones that caused havoc and chaos on N-Tek, making Forge Ferrus very angry. Max and Steel were even forced to stay on N-Tek's base to take care of them, otherwise, they would probably destroy it.
Eventually, Max and Steel managed to capture all the clones with Turbo Speed and Turbo Clone Modes. Later on, Max had an idea of sending those clones into a Makino Destroyer with a Deployer ship that they captured days ago, which Berto referred as "Trojan Puppy" mission. Later on, the clones were sent to the ship and bothered Blast, Chomp and Prism Link, even though they managed to destroy them all.
They have the same abilities as the original Furbo, even though they appeared randomly using the green lasers.
They were a part of the operation "Trojan Puppy" consisting in sending them into a Makino Destroyer. It is a obvious reference to a historic event including the Trojan Horse, where the Greeks used it to enter in Troy city and win the war.