Youngsters are approaching 10 months of age here in San Francisco. Above is a photo of one of them. They are still slightly smaller than adult coyotes, but seen alone, most folks would not be able to tell the difference.
If you are lucky enough to observe them in action, you will find that their behavior gives away their young age: they are more flighty, erratic, awkward, zippy and distrustful than older coyotes. They are curious but most likely will observe folks and dogs from behind a bush and at a substantial distance, as seen in this photo to the right.
Coyotes tend to play with their siblings, unless it is an “only child” — I’ve observed several one-pup families in San Francisco — in which case they play with a parent. Play is their main interest and occupation, and when they are together, they are constantly and joyfully playing roly-poly, pell-mell, tumble-bumble wrestle, chase and tug-of-war.
Youngsters are also good at entertaining themselves. I’ve seen individual youngsters play with an abandoned tennis ball for over 20 minutes, bounce themselves down a hill repeatedly, chase their tail — no different from your own pet. They can also be seen practicing their hunting skills alone, though with substantially less aplomb than an adult.
Even if you don’t see a parent around, a parent is very likely to be close by keeping an eye on things, just in case a dog might try chasing. A parent will run in to its pups’ rescue if it feels the youngsters are being at all threatened. Youngsters normally take cues for their own behavior from the parent who is nearby.