WOOF! - The Complete Series 8 - 2DVD set [Digitally Remastered]:

Rex felt a curious tingling in his hands and feet. He felt his nose becoming cold and wet, his ears becoming flappy. The thought in his mind was: 'I'm turning into a dog!' Rex is a perfectly ordinary boy. Perfectly ordinary that is, until the night when, in fifteen seconds flat, he turns into a dog! Rex and his best friend Michael are determined to sniff out the truth - what makes an ordinary boy suddenly go 'woof'?

Classic light hearted childrens drama  from 1995              

CAST:

Liza Goddard ... Mrs. Jessop
Adam Roper ... Rex Thomas
Owen Brenman ... Mr. Thomas
Monty Allan ... Michael Tully

Guest Stars:  Leslie Grantham (Eastenders, The Paradise Club), Natalie Roles (The Bill),
Leslie Phillips (The Navy Lark, Carry On).