Hi, i have 2 boxers, one white and one fawn, when i take them out to the park to let them go swim and play, my fawn one will only go knee deep in the water, i think the deep water scares him, but the white one, he is just nuts, he likes to dive in off the bank, he will go underwater and look around, and just have a good old time. does anyone elses boxer like to go underwater or is it just mine?