Dogs can become depressed, and sometimes they do need to be cheered up.
Depression might happen only once in a while, like when something new upsets the routine.
Depression might be triggered by a sad event, like the death of a playmate or even a human family member.
If the vet can't find any physical cause for the sadness, here are a few things you can do to try to cheer up your dog.
If you can take your dog for a walk in the morning, when the sun is shining, it should help him throughout the day.
Spend extra time with your dog. As mentioned above, this time should really be spent walking outside.
When your dog is playing or acting normal, praise him lavishly and give him some of those treats.
As well as distracting him, a new toy might make your dog happy.
Dogs are social animals. If you are really not able to make time in your schedule, get him a new puppy