There's not much on this, so I'm winging it. Plus, I'm curious to see if this species could actually succeed in advancing to the Stone Age.
Basically, a species that I have created (the Verrisirs) evolved on the planet Vixeruka (I described some characteristics of the planet in this question: Planet with two moons and rings? Is it possible? ). Now, the planet being a tropical rain forest world (not 100% tropical, since it would be realistically impossible, we could say that Vixeruka is 69% rain forest, 10% savanna, 6% desert, 5% arctic, and 10% mountain for simplicity's sake). Now, the Verrisirs are a caninoid race (humanoid canines).
When designing them....
Okay, I'll be honest here, I picked things that I thought would be cool and make them unique.
Digitigrade: this seems to be a feature common among a good many predators (not all, but ones like canines and felines come to mind).
Claws: The claws would be useful in both combat, hunting, and climbing trees. Yes, you have dogs that can climb trees. While I read a question someone posted here that such a canine would probably evolved into a primate (if I'm understanding his answer correctly). Personally, I don't see that happening, since it would involve other factors. What those factors are I don't know, so this might need some more thought.
Thin: They would be "thin". Meaning, that their bodies lack a subcutaneous layer usually common among humans and other humanoid species. This can serve as a determent for adapting to different climates. And while they aren't as strong as humans, they do have the advantage of being fast, nimble, and agile, which would make them able to chase down prey or escape other predators. I can see Verrisirs being descended from predators that are both stalk and ambush predators as well as pack-oriented predators.
Large, triangular-shaped ears: Similar to other canines, a Verrisir's ears would be able to give them four to five times the hearing ability of a human. Although this does also present a drawback as well, especially in regards to sonic weaponry (my opinion is that races that have a stronger sense of hearing would be vulnerable to high frequency attacks/weapons, such as those using sonic technologies). In addition, the ears would allow them to both display emotions (depressed/sad: the ears sink downward; angry/mad/enraged: the ears would bend back slightly) and be capable of responding to sounds around them (by twisting or moving).
Sense of Smell: Canines possess extremely superior sense of smell, so it made sense to have Verrisirs also possess this. Unlike most humans, a wolf for example, would be able to tell the different spices and ingredients used in a stew from each other, even after the stew was made. This to me is a useful ability and would greatly aid a species, and thus I gave this to the Verrisirs.
Fur: Verrisirs have oily fur, similar to that of certain dog breeds as well as jaguars and tigers, which aids them in swimming and keeps them from being slowed down by wet fur. Not to mention, a lot of rain forests tend to have a lot of rain.
Sight: Canines have excellent night vision (the cat actually is better though). While the planet does have a lot of light due to the rings and two moons, there would be places deep in the jungles and swamps that would get little to no light so having the ability to see in the dark would be quite advantageous. So, instead of canine vision, Verrisirs would have feline vision (in addition to the slit pupils of felines as well).
Pack Society: Pretty self-explanatory with this one. Strength and safety in numbers would greatly prove advantageous to the Verrisirs.
Another aspect that I thought would make them unique would be their blood. I did a good bit of research on this now. Cobalt was the mineral I researched. So, they use cobalt to bond with oxygen atoms in the same way we use iron to bond with oxygen atoms.
Here are some other (and I think minor) details about the Verrisirs:
Strong muzzles: Think of their muzzles being similar in biting power similar to wolves and jaguars
Three fingers and a thumb: This on each hand now. Not sure if this would present a disadvantage or advantage or not really matter
Able to run on all fours: This would mean that they have pads on the palms of their hands. It would also mean that they could switch between walking on two legs or running in the wild on all fours.
My question is what factors would enable them to reach the stone age successfully? Thank you.