We've all used the extremely happy voice to trick our pups into going to the vet... turns out they can see right through that fake facade because they understand the words we say.
Researchers monitored dog's brain activity and found out they process the meaning of words similarly to the way humans do. This is wild and also makes me feel kinda guilty for faking excitement over a vet visit.
Basically this mean your dog knows you've been lying to them. So give your pup some extra snuggles and treats because they deserve it.