I have a 3 month old Jack Russell... in the morning, I see that where he has slept there are many tiny, white, hard things in the covers. They resemble tiny sesame seeds. Someone please tell me what this is and what I can do!
Thank you

Have you been feeding him bones? At times, digestive tract can't handle a lot of calcium. I think he is having little poop, and that is what they are.

Have you seen anything else strange? Like rice shaped worms on his rectum or in his stool.
They could possibly be dried tape worm segments.
If they are tape worms, it will require a special dewormer that you can get from your vet.