Clifford jumps and runs just like a regular dog which likely means his muscles and bone density are magnitudes stronger than the Indominus Rex. I imagine the Rex gets the first hit, then Clifford shatters his spine with a well placed counter strike. Remember Clifford has the muscle mass and ridiculous bone strength to dig holes in the ground that would take excavators hours for fun. Look at this bullshit. I don’t care if IR gets a good bite on Clifford’s neck, he isn’t cutting through Clifford’s fucking steel cord muscle fibers.

I think Clifford takes this 10/10 times. Clifford isn’t bound by the square scale law that makes an animal 2x its size 8x heavier as he acts like a normal dog, just bigger. This gives him body density and strength far beyond earthly limits. IR is just a slightly larger Trex. Trex are quite frail in real life. A trip or fall could just outright kill one or at least cause enough bone damage to put it out of action. Clifford on the other hand bounds and rolls like he’s never even heard of gravity.

Edit: I don’t know why I’m still thinking about this but let’s go over the stats. Assuming a 30 foot Clifford with the approximate dimensions, density, and attributes of an average male golden retriever but scaled up. I-Rex has a lot of official stats so that makes it easy to mathematically show just how badly it goes for the lizard.

Clifford weighs approximately 143 tons. I-Rex is only 8 lol.

Clifford’s bone and muscle density scales to approximately 4,000x that of a normal golden retriever if it wants to move like one at that size. It would take about 12,000 tons of impact force to crack Clifford’s femur and something like 2,000 tons to shatter his skull. I-Rex’s bone and muscle density should be fairly robust for the average animal kingdom but compared to Clifford he has glass bones and paper skin.

T-rex bite force is estimated to be somewhere around a total of 5-6 tons. Clifford, if an average dog, would have something around 538 tons. Mosasaurus has a bite force of only 7 tons and that was more than enough to kill I-Rex.

Clifford is going to hit max speed around 350 mph. Rex’s max speed is 30 mph. lol.

tl;dr Rex gets knocked over one or two times and dies. Clifford then mounts and humps the dying dino like the bitch he is with the force of a screaming freight train. Game over Rex.