Poor Britney. If the collapse of her relationship wasn’t enough, Britney Spears’ puppy has been in and out of hospital.

The singer feared her dog was critically ill this week, rushing it to the vet for the third time in less than two months.

Worrying: Britney Spears had to rush her dog Hannah to the vet for the third time since November

The purebred teacup Yorkshire Terrier named Hannah has been struggling to breath and has developed numerous health concerns, Radar Online is reporting.

A source told the online site the singer first rushed the miniature dog to the vet in late November after it fell ill.

‘(Britney) found Hannah listless, eyes half shut, not responding to voices, not eating, and having trouble breathing,’ the source told Radar Online.

After an additional visit to the veterinarian the dog seemed to be doing alright but then on January 3, the dog was taken back to the vet for a battery of tests, including liver function, and had to be closely monitored after she was found to have ‘an erratic temperature and fluid in the lungs’.

Under monitoring: The dog was found to have fluid in its lungs

‘Her condition remains unstable and if it were not for Britney’s money and ability to pay the vet bills, Hannah would be dead by now,’ the source also told Radar Online.

There are fears the tiny Yorkie’s breeding may be to blame.

According to Radar Online the Til The World Ends paid $1,800 for the dog at the Barkworks store in Thousand Oaks, California and the chain store has recently come under intense criticism for allegedly obtaining dogs from puppy mills and for false advertising, according to The Animal Legal Defense Fund which has a class action suit against the company.

Puppy love: Britney often takes the mini Yorkshire Terrier to X Factor with her and dresses it in outfits to match her own

‘Its store in LA’s posh Westside Pavilion was shut down by the city of Los Angeles because of a number of sick animals found at the location. Barkworks even has an ‘F’ rating from the Better Business Bureau,’ the website reported.

Despite being ill the dog – who has its own twitter account as ‘Britney’s B***h’ – tweeted on Friday that it was hungry for bacon strip dog treats.

The pooch’s poor heath comes as Britney confirmed she has split with her partner Jason Trawick.

Bad timing: The singer just revealed she and fiance Jason Trawick have split

Britney said in a statement: ‘Jason and I have decided to call off our engagement. I’ll always adore him and we will remain great friends.’

Jason added: ‘As this chapter ends for us a new one begins. I love and cherish her and her boys and we will be close forever.’

Britney’s representative Jeff Raymond told Mail Online: ‘Britney Spears and Jason Trawick have mutually agreed to end their one-year engagement.’

Computer savvy: Hannah has her own Twitter account with almost 36,000 followers