5.Sudden Loss of Interest
If your dog is no longer interested in the things that they used to get excited about such as going for walks, playing, and other activities, that is a sign of changes occurring. While older dogs will slow down over time, a depressed dog will suddenly lose interest almost immediately.
Of course, even with these signs, your dog may not be depressed and instead may be suffering from a physical condition which is affecting their behavior. However, you should take your dog to the vet if you see them experience any of the aforementioned changes. The sooner you act, the faster your dog will respond to treatment.
