It’s terrible watching your pet suffer, especially when you’re not sure how they’re in pain. They can’t speak, which means they can’t tell you exactly what’s wrong. Instead, their behavior changes. A dog suffering from chronic pain may exhibit increased aggression, anxiety and lethargy. Or, in other cases, your dog may not show any signs that they’re in pain at all. This is why observation is so important. When something seems off, it’s likely because it is.