After a day of daycare your dog will most likely go home tired, thirsty and possibly hungry. This is completely normal behavior. During the day, while the dogs play, they may not take the time to stop and drink water as they should.
How long are dogs tired after daycare?
One or two 2 hour naps are not sufficient to provide enough rest and recovery between play sessions in the long term. A full 24 hours is good. 72 hours is even better.
Why is my dog acting weird after daycare?
Dogs who do not establish secure attachments in their relationship with their mothers are more likely to experience social withdrawal, depression, and anxiety. Male dogs with an insecure maternal attachment are more likely to exhibit conflict, aggression, and acting out.
Do dogs get sad at daycare?
In both cases, dogs tend to be outwardly sad and depressed at daycare. Sometimes, the dog becomes insecure because the alpha pack leader of the family is now absent, leaving the dog in limbo and causing the dog to be frustrated and more aggressive at daycare.
Is too much daycare bad for dogs?
Daycare isn't without risks. A daycare environment can be overwhelming and overstimulating for some dogs. Depending on how the daycare is structured it's very easy for dogs to get exhausted which can lead to physical injuries.

Below are two helpful articles on a similar topic π
Why is dog daycare so beneficial to dogs?Why do dogs get sick in kennels?