Doggy Day care works great, if you can afford it. Especially for puppies and younger dogs, who needs lots of socialization and watching that they do not get into trouble. When Pippin & Merry were younger, they went to day care 5 days a week while I was at work. They did fine with the Bordertella (kennel cough) vaccine. No problems, but be aware that they could still get kennel cough. The vaccine doesn't protect against all strains of the virus. However, when Pippin did get a cough it was very mild and only lasted a few days. Not the full blown kennel cough, so I think the vaccine protected him.
Last year I purchased my parents home and my parents live with me. They are retired and are often home with the dogs, so they are not alone very much. So I didn't need daycare anymore. But when I got Jolly, I didn't want my parents to deal with all the puppy problems.
Currently with Jolly, I have an agreement with my groomer to watch him during the day. I drop him off on my way to work and pick him up on my way home. He plays his heart out with the groomer's yorkies, so that when he gets home at night, he is one calm, sleepy puppy. I had him get the kennel cough vaccine too, just in case my groomer cannot watch him, I have him registered at a doggy day care.
I highly endorse a daycare situation, if you cannot be home with a cavalier. They crave the affection of others and daycare is a great experience for your dog.
Charleen and Cav's: Pippin (ruby male), Merry (b&t female), Luke (blenheim male) & Jolly (tri male puppy)