For all real numbers $x,y,z$ such that $-2\leq x,y,z \leq 2$ and $x^2+y^2+z^2+xyz = 4$, determine the least real number $K$ satisfying \[\dfrac{z(xz+yz+y)}{xy+y^2+z^2+1} \leq K.\]
To solve the problem, we need to find the least real number \( K \) such that the inequality
\[
\frac{z(xz + yz + y)}{xy + y^2 + z^2 + 1} \leq K
\]
holds for all real numbers \( x, y, z \) satisfying \( -2 \leq x, y, z \leq 2 \) and \( x^2 + y^2 + z^2 + xyz = 4 \).

1. **Substitution using trigonometric identities:**
   We start by substituting \( x = 2 \cos A \), \( y = 2 \cos B \), and \( z = 2 \cos C \), where \( A, B, C \) are the angles of a triangle. This substitution is valid because for any angles \( A, B, C \) of a triangle, the following identity holds:
   \[
   \cos^2 A + \cos^2 B + \cos^2 C + 2 \cos A \cos B \cos C = 1.
   \]
   Therefore, 
   \[
   x^2 + y^2 + z^2 + xyz = 4 \cos^2 A + 4 \cos^2 B + 4 \cos^2 C + 8 \cos A \cos B \cos C = 4.
   \]

2. **Simplifying the inequality:**
   Substitute \( x = 2 \cos A \), \( y = 2 \cos B \), and \( z = 2 \cos C \) into the inequality:
   \[
   \frac{2 \cos C (2 \cos A \cos C + 2 \cos B \cos C + 2 \cos B)}{4 \cos A \cos B + 4 \cos^2 B + 4 \cos^2 C + 1} \leq K.
   \]
   Simplify the numerator:
   \[
   2 \cos C (2 \cos A \cos C + 2 \cos B \cos C + 2 \cos B) = 4 \cos C (\cos A \cos C + \cos B \cos C + \cos B).
   \]
   Simplify the denominator:
   \[
   4 \cos A \cos B + 4 \cos^2 B + 4 \cos^2 C + 1.
   \]

3. **Analyzing the inequality:**
   We need to find the maximum value of the expression:
   \[
   \frac{4 \cos C (\cos A \cos C + \cos B \cos C + \cos B)}{4 \cos A \cos B + 4 \cos^2 B + 4 \cos^2 C + 1}.
   \]
   Since \( \cos A, \cos B, \cos C \) are bounded between -1 and 1, we need to check the boundary values and critical points to find the maximum value of the expression.

4. **Testing boundary values:**
   Let's test the boundary values \( \cos A, \cos B, \cos C \in \{-1, 0, 1\} \):
   - If \( \cos A = 1 \), \( \cos B = 1 \), \( \cos C = 1 \):
     \[
     \frac{4 \cdot 1 (1 \cdot 1 + 1 \cdot 1 + 1)}{4 \cdot 1 \cdot 1 + 4 \cdot 1 + 4 \cdot 1 + 1} = \frac{4 \cdot 1 \cdot 3}{4 + 4 + 4 + 1} = \frac{12}{13}.
     \]
   - If \( \cos A = -1 \), \( \cos B = -1 \), \( \cos C = -1 \):
     \[
     \frac{4 \cdot (-1) ((-1) \cdot (-1) + (-1) \cdot (-1) + (-1))}{4 \cdot (-1) \cdot (-1) + 4 \cdot (-1) + 4 \cdot (-1) + 1} = \frac{4 \cdot (-1) \cdot 1}{4 - 4 - 4 + 1} = \frac{-4}{-3} = \frac{4}{3}.
     \]
   - If \( \cos A = 0 \), \( \cos B = 0 \), \( \cos C = 0 \):
     \[
     \frac{4 \cdot 0 (0 \cdot 0 + 0 \cdot 0 + 0)}{4 \cdot 0 \cdot 0 + 4 \cdot 0 + 4 \cdot 0 + 1} = 0.
     \]

5. **Conclusion:**
   From the boundary values, the maximum value of the expression is \( \frac{4}{3} \). Therefore, the least real number \( K \) that satisfies the inequality is \( \frac{4}{3} \).

The final answer is \(\boxed{\frac{4}{3}}\).