A border collie waiting, panting heavily on a warm day, after playing fetch in a public park

border collie collie canis lupus familiaris fetch canine retrieve dog ears obedience park domestic animal playing pet purebred leisure activity retrieving obedient playful trained attentive one animal trick outdoor public park exercising summer excited exercise nose grass tongue positive emotion happy nature activity border mouth cute green learn day lifestyles warm fun pant mature joy fur game