Need to build up stamina

Need to build up my stamina for my Search & Rescue training. Under the hot sun, my furry body gets tired easily. This is a big disadvantage to small dogs like me as we are so close to the ground surface.

Today I did a high jump like 3 times my body length, the officers and Mummy praise me for being a daring girl, pity Mummy did not capture it on camera.