Snug as a bug

Today we went for a run/walk to tire him out before our guests arrived (no such luck), this was followed by a bath to make him smell pretty for cleanliness! After this, I noticed Stan started to tremble whilst sat on my knee? I thought he may have been cold as he was still a bit damp! So I wrapped him in the blanket! But his trembling continued for a little while? I have no idea what caused it? As the walk was no longer than usual, and he ran faster than me! I will be keeping an eye on him today!