It’s hard to believe, but Vetstreet is 3 this month. We’ve come a long way since we launched in August 2011, and we couldn’t have done it without you. Thanks to our fantastic readers, we have more than 3 million unique visitors a month and 364,000 Facebook fans. To show our appreciation — and to celebrate three incredible years — we rounded up our favorite fan-submitted photos of cats and dogs who are having a ball on their birthdays.

Dude, we are so excited it's Dude the Golden Retriever's second birthday. Sweet shades, man.

Norman the 6-month-old domestic shorthair is a great party guest — he wore this festive hat for his brother's birthday.

We can't believe Halo the Bichon Frise is 5 years old. She doesn't look a day over 3.

It's Maggie the Shihpoo's party, and she'll wear a furry pink princess hat with glittery stars if she wants to.

If it were up to Radio Flyer, a 5-year-old Jack Russell Terrier, birthdays would be celebrated for a whole week. No, a whole month. Well, that's a really long time in dog years. Maybe two weeks is enough.

Dixie the Doxie (pictured on the right) is having a blast at Dexter's 12th birthday party. We heartily approve of the Lisa Frank cat party hats.

Good girl, Chloe! This Golden Retriever received the perfect gift for her seventh birthday.

Birthday boy Roscoe, a Bull Terrier (left), went all out for his fifth and had a pool party. His girlfriend, Sinsa (right), had the time of her life.

We're so happy to hear that Laika the Labrador Retriever celebrated her 11th birthday and, even better, one year as a cancer survivor.

Birthdays are the best when you have dogs. Ozz the Pit Bull-Mastiff mix and Honus the Labrador Retriever say, "Happy birthday!" to their owner.

It's OK. Sometimes birthdays can be a real drag. Olive the Soft Coated Wheaten Terrier isn't too thrilled to turn 2.

We can't blame Beau the 3-year-old Shih Tzu for not liking this hat, but at least his party wasn't Frozen-themed like all his other canine friends' birthdays. Let it go, Beau.

For a long time, Krisi the 10-year-old Shihpoo didn't understand why humans made such a big deal out of birthdays. Now that she is older and wiser, she has learned to embrace her special day and looks forward to it every year.

Simba, a 4-year-old Cockapoo, can't hold his birthday smile much longer. Really, he can't. Please, no more photos.

Mikey the Cavalier King Charles Spaniel is over the hill. He's 15! We're wishing him many more happy and healthy years ahead.