Borzoi

Russian nobility used Borzoi to course wolves, and the breed still carries that size and power, with males often topping 100 pounds. Indoors it is one of the calmest large dogs you can own: quiet, catlike and content to drape itself across a sofa. Prey drive is strong and a running Borzoi covers ground fast, so a lead or high fence is non-negotiable. Like other deep-chested breeds it is prone to bloat, a twisted stomach that needs emergency surgery, so owners learn the signs and avoid hard exercise straight after meals.