“I can’t even find the words to describe my heartbreak on so many levels. Nala was perfectly healthy when she went to the groomers yesterday but came out hyperventilating and couldn’t catch her breath.
“We rushed her to the vet and she passed hours later. I’m sharing this in hopes that it might prevent this from happening to other dogs.
“Her life was taken away from her way too soon. She was my beautiful queen and stayed by my side for nine years through everything.
“Please be careful who you send your dogs to because you don’t know what goes on behind closed doors. One day without Nala on Earth feels like an eternity.”
TMZ reported that the dog had fluid in her lungs, a rapid heart rate and neurological problems.
Friends of the family say her motivation to sue is to prevent the same thing from happening to other pet owners.
In a further Instagram post, Peltz said that other people had suffered similar experiences with dog groomers.
“I am relentlessly investigating the situation to find out exactly what happened in that groomer’s van. I am doing everything I can to uncover the truth,” she added.
She added that the groomer was not co-operating with the family.
Chihuahuas bought from a breeder cost from US$500 to US$2000 ($820 to $3280). A shelter would look for donations ranging from US$100 to US$600 ($164 to $984).
The groomer saga is not the couple’s first involvement in a legal dispute.
Peltz’s father Nelson, a billionaire investor, sued the Miami-based event-planning firm Plan Design Events (PDE) hired to orchestrate the couple’s wedding on his oceanfront estate in Palm Beach in April last year.
He accused the company, run by Nicole Braghin and Arianna Grijalba, of failing to return a $159,000 deposit. They counter-sued, describing Peltz as a “billionaire bully” and accused the family of putting them through “wedding planning hell”.
The planners were hired six weeks ahead of the wedding and sacked nine days before the event,
The billionaire’s legal team alleged that the planners “viewed this as an opportunity to take advantage of Peltz by making material misrepresentations on both their website and in person regarding their experience, expertise, and capability of planning the wedding”.
The dispute was settled out of court in September with the agreement being confirmed by the company in a statement to People magazine.
“As part of the settlement, PDE will make a donation in the name of Nicola and Brooklyn to the CARE Ukraine Crisis Fund,” it said.
