Dog owners are being warned to be careful when walking their beloved pet on Perth’s beaches, with a deadly sea creature washing up. Several veterinarians have reported owners bringing in their dog after walking it on the beach, with at least two having died. One owner on a Perth community Facebook page told how they walked their furry best friend at Hillarys dog beach on Sunday and she rolled around in the seaweed as usual. On its website, Vetwest warns of the toll sea hares are taking on dogs across Perth. “We ask that all dog owners please take extra precaution when visiting the beach with your companion.