Members of the Raptor family of dinosaurs (the famed Jurrassic Park Velociraptors were actually chicken sized... an animal like the ones in the franchise wasn't discovered until the first film was in post production) are thought to be highly social predators that used persistence hunting strategies to hunt and ambush prey. This is important because among the most intelligent animals in the world, high society functions and persistence hunting are common through lines. The later is impossible without the former. In fact these attributes are part of the reason why humans have developed the most complex language skills of all animals Humans unique distinction as tool using distance persistence predatory hunting supplemented by omnivore diet is very unique in the animal world and considered to be the winning combination for a genius predatory animal, but it's the total combination that is unique, not a single trait.
Canaines are also persistence predators and the fact that dogs are "mans best friend" seems to be a rather unique evolution in the aninmal world as well... typically when two animals with the same niche occupy the same environment, one will go extinct... but domestic dogs and humans seemed to have teamed up and worked together. Compare to wolves, which would be extinct if but for humans intentionally backing off and giving them some space.
Animals with advanced social communities are also not unique and are exhibited across the kingdom including many insects, such as bees, who are further removed form humans than dinosaurs genetically speaking. It's actually a skill that doesn't take long to aquire on an evolutionary time line. Consider your pet cat, and the difference in the meow it makes when it wants you to feed it and when you step on it's tail. The Cat's Meow evolved exactly because of humans use of vocal communication. Species of wild cats have far less communicative range of sounds than a house cat and will rely on body language when communicating to others rather than vocal sounds, which work for House cats because humans are more understanding of vocal language.
Tool use is also not unsusual and while most animals that use tools tend to be very close cousins of humans (most primates have some tool use skills), it's not exclusive. Dolphins will use sea spounges to protect their nose when digging in sea floor sand, otters have their "rock" and will use kelp blankets to keep from floating off while sleeping. Some species of birds, including Corvins (crows) are also quite intelligent and documented tool use. This would also favor Raptor like Dinosaurs because of all the dinosaurs, Raptors are the closest relatives of modern birds and share more common liniages than any other dinosaur species known.
I discussed elsewhere, but the time between the beginning of dinosaurs and the age of man would be more than ample for intelligence to develop. If we condense the whole timeline of Earth's existence to a single 24 hour day (Midnight of this day occurs right now), the oldest known fossil of a living thing would appear at 5:36 am, sexual reproduction first appear just after 6:00, terrestrial plants would appear. Dinosaur would exist for the 45 minutes between 10:56 PM and 11:39 PM. The age of mammials be only exist less than half that time (21 minutes) by comparison and Homo Sapien would only appear at 11:58:43 PM... a 1:17 minute period of time.
With specific deference to the Voth, Voyager showed that the closes dinosaur known to be related to the Voth was the Hadrasaur, which was a herbivore. As of now, grazing animals were likely not conducive to evolution a highly developed civilization. Evolution is not going to favor a design that is efficiency to the niche, and intelligence is a very costly investment for a creature that does need it let alone the ones that don't, but the thing about evolution is that similar traits are known to develop for wildly different reasons. The octopus, for example, has the comparative intelligence of a house cat despite the fact that no where else in invertebrates is there a similarly intelligent species. This would suggest that the needs conducive to the octopus' evolution of intelligence of this level are not the same needs that lead mammalian or avian intelligence. There's a world of difference from the very neurological systems that support it. And yet, it thinks more like us than any of it's more closer mollusk relatives.
Evolution will only produce a creature that is "smarter than your average bear" if there exists a reason for it to do so. If no such reason exists, average bear is just fine. Consider the Shark: Their evolution as one of the top predators of the ocean occurred long before the dinosaurs walked the Earth... and Sharks back then have little in difference to our modern sharks. It is one of the most successful innovations of evolution... and we don't consider it to be the sharpest knife in the drawer by any stretch of the imagination.