First, always take a tour of the facility you want to introduce your furry kid too. Look for cleanliness, security, and how many attendants per dog. There should be about one attendant per 5-6 dogs. Attendants are also there to clean up the messes that dogs make from defecting, vomiting, and blood if any dogs get into a serious altercation.
Finally, the facility should be secure from possible attempts by curious dogs to see what is on the other side of the gate and from unauthorized access by people who aren't supposed to be there.
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All of these are important in keeping your fur baby happy, healthy, and secure. Dogs before going to daycare should receive all of their standard immunizations plus Bordetella (kennel cough) before they will be allowed to mix and play with other dogs, but there is one more risk that pet owners should be aware of when finding a daycare facility for their K9.
There is a protozoan called Giardia, which is spread through a dog's feces and can cause severe diarrhea and abdominal discomfort. If it is not treated properly with antibiotics it can be fatal. This is why it is important to ensure the cleanliness of the facility. If facilities have standing water, like ponds or doggy pools this is a great way to spread Giardia. If dogs walkthrough infected feces, play in the pool, and then drink from the same pool they will get Giardia, so please be aware of this.