Briz: No, but he is a dog beach dog. He only goes to play ball, and he's not allowed to play ball on grass, dirt, or wood chips because he shreds his stop pads. He requires a ball and a chuckit launcher, otherwise he will find someone with a launcher and be their dog until physically removed from the area.
Ru: Only likes other chihuahuas. Are there chihuahuas at the park? Otherwise he is bite-sized and I really don't like dogs 10x his size rushing up and sniffing so hard they hoist his back end off the ground.
Uly: Nope, nope, nope. Uly mostly interacts with other dogs by biting them hard. He hasn't figured out anything else yet.