A couple who used the dog sitting app Wag! to find someone to take care of their beloved puppy were left horrified when the sitter was allegedly found passed out on their bed - having drunk a bottle of vodka and splattered eggs across their kitchen.

Rebecca Smith and her partner Alyssa Bates, who live in Chicago, went to Nashville for a wedding Friday and used the app, which advertises local 'trusted' dog walkers for hire.

But when the dogsitter didn't show up on time and they didn't receive a confirmation from the electronic drop box that the keys to their home had been collected - they became worried for their one-year-old pup Mickey.

Rebecca Smith and her partner Alyssa Bates (pictured), who live in Chicago, went to Nashville for a wedding Friday and used the app, which advertises local 'trusted' dog walkers for hire

But when the dogsitter didn't show up on time and they didn't receive a confirmation from the electronic drop box that the keys to their home had been collected - they became worried for their one-year-old pup Mickey

'We hadn't heard anything, had no proof that Micky had been taken out, that she'd been fed,' Smith told CBS. So, the couple called friends to go to their apartment.

When their friends walked to the front door of their West Rogers Park property, they heard the puppy whimpering and found all the doors open and the kitchen a wreck.

Fearing the home had been burgled, they were ready to call the police until they checked the upstairs room and found the dogsitter passed out drunk.

'They came up our back steps and saw that the Wag! lockbox was open, and there were no keys inside. So they tried the door. It was unlocked and they could hear Micky crying inside,' the couple said.

'They walked back to our back bedroom, opened the door and found the Wag! walker intoxicated, asleep in our bed,' Smith said.

When their friends walked to the front door of their West Rogers Park property, they heard the puppy whimpering and found all the doors open and the kitchen a wreck

'They walked back to our back bedroom, opened the door and found the Wag! walker intoxicated, asleep in our bed,' Smith said (the unmade bed is pictured above)

Fearing the home had been burgled, they were ready to call the police until they checked the upstairs room and found the dogsitter passed out drunk

'To find the person we had trusted, not only with our space but with our dog, not taking care of either of those and actually, completely violating everything, was pretty shocking.'

Now the couple strongly believe dog owners should look beyond Wag! for their dogsitting needs in future.

Wag! say they no longer employ the disgraced dogsitter, calling her actions completely unacceptable and contrary to all of their guidelines. An investigation is underway.

Smith and Bates asked to be reimbursed by Wag! for their cleaning expenses but say they would never use the company again and strongly encourage owners to meet their dogsitter in person beforehand.