LOS ANGELES — The Jaguar Supersport, ’65 Ford Thunderbird and ’73 Alfa Romeo are taken by other clients today, so Dug — an 8-year-old golden retriever — is being chauffeured to the Sunset Strip in a presidential Cadillac stretch limo for his spa treatments. He’s headed to Collar & Comb in West Hollywood, where he’ll be getting a blueberry facial and exfoliating mud mask from the same professionals who groom the mutts of Gwyneth Paltrow, Mark Wahlberg and Dakota Johnson.

Dug sits upright on the limo’s black Corinthian leather seat, flanked by crystal liquor decanters on one side and a TV and VCR on the other. He gazes out the window, tongue hanging out excitedly, as the spiky palm trees whiz by. Then he flops down and chomps on a stuffed Chewy Vuiton Paris bone toy.

Such is the world of d

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