Alex Borsuk and her border collie, Otto, have run marathons, climbed volcanoes, and even skied together. She says that while bringing her dog with her is enjoyable for both of them and helps motivate her, it is important to be aware of safety concerns for your dog. First, always check with your vet on what is healthy for your dog, such as at what age can they go on long runs. Keeping your dog in shape (and recognizing that this can take time) is also important, as well as understanding that they will need to eat more. Solid training is also necessary, in order to keep your pup safe and make them more comfortable around others and during activities.