Went for a walk earlier and dog went into ultimate sniffer dog mode. He was running in zigzags across the field with his nose to the ground & then sniffed all the way home. When we got back he wouldn't settle, kept whimpering and pacing. Ended up taking him out 2 more times and the same thing - frantic, tugging on the lead, nose to the ground. I thought he might lead me to a child trapped down a well, but he didn't. It's 2 hours later now and he's only just starting to calm down! & it's taken lots of attention, treats, toys etc.
Why's he being weird?