hi just wondering what you lads think,my brother got a nice little dog collie cross x,I went out walking with her today through a rush field and a lot of burrows,the dog just sticks it nose to the ground and of she goes,she is rising them but rushes to big to catch,and when he got her,he put the ferret in to few burrows and she was sticking her head in to the burrows,are you better to leave her in the slip,or let her learn of the lead,what you'd think she is only 15 months old nice little dog to