"What's the matter?"
"I don't know."
The team halted as soon as he spoke, and the horse mule turned a questioning head toward his mate. He sniffed softly at the mare, and Joe hopped from the wagon seat to walk to the head of the team. The horse regarded him anxiously, but the mare stood tiredly in harness with her nose almost touching the Trail. Gently, Joe took hold of their bridles and led them into grass. The mare gasped for breath.
"She's sick!" Joe said. "We'll have to stop!"
Tad came over. His rifle, that had not been out of his sight since he'd owned it, hung in the crook of his arm and concern was written on his face.
"What's wrong, Pa?"
"I don't know."
As gently as possible he unhitched the team, and stripped their harnesses off. The horse mule he picketed, but the mare was left unhampered. She walked a few uncertain steps and halted. The horse followed anxiously, and stood very close to her. He moved aside when Joe came in for a closer examination. Soothing the sick beast with his voice, he lifted her flabby lips and looked inside her mouth. Her tongue was hot, her breath foul.
Joe stepped back. He had considered himself familiar with mules and the diseases of mules, but he was not familiar with this. It must be something peculiar to western country; maybe last night or this morning the mule had eaten something that poisoned her. Or perhaps it was the result of some poisonous insect's bite. It was not snake poison; Joe was familiar with snake-struck mules and he knew that, if they were rested, they would recover. He filled a bucket at the water barrel and held it under the mare's muzzle, but she took only a few sips and staggered away. The children watched concernedly and Emma asked,
"Is she going to die, Joe?"