Chasing Tails
There is no way you haven’t seen a dog run in circles chasing their own tail. This is simply another sign of playfulness however, it can be a sign of OCD too. Yes OCD in dogs is a thing. Excessive chasing of their tailscan resemble behavioral issues or health problems. Additionally, chewing their tail can mean that they have allergies or a gland problem.
Licking
This one we are a tad too familiar with. A lick here and there is their version of a kiss and an “I love you.” They also enjoy the taste of the minerals and nutrients in our skin- if they take the licking overboard training can correct this behavior.