A proposed ban on the controversial training devices was due to come into force in England today but it is understood Parliament has yet to find time to debate it.
The collars, which are already illegal in Wales, zap pets via remote control to stop unwanted behaviour.
Conservative MP Henry Smith said: “Electric shock collars are not only cruel but also ineffective when training dogs and cats.
“This is why many parliamentarians, including myself, welcomed the Government’s announcement they would put an end to their use.
“Positive reinforcement training techniques, rather than punishments, have proven to be far more effective.
“It is time for the Government to make good on their promise to ban the use and sale of electric shock collars, which simply serve as implements of cruelty.”
Tory MP Selaine Saxby added: “Whilst I appreciate that there are a lot of demands on parliamentary time, it is disappointing to see this legislation banning electronic shock collars lapse.
“I hope this legislation can be reintroduced and taken through the House as quickly as possible.”
Mark Beazley, chief executive at The Kennel Club, said: “We are extremely disappointed that the Government has failed to deliver on its promise of banning these outdated and cruel devices, which cause physical and psychological harm.
“We have long campaigned for this ban, which is supported by more than three-quarters of the population, and backed up by research that demonstrates these devices are unnecessary and unacceptable, especially given the vast range of positive training methods available.
“This is yet another commitment to animal welfare that has fallen off the political agenda and, by not imposing this ban as promised, more dogs will sadly continue to suffer.
“We urge Defra to follow through with their promise to ban these abhorrent devices and to address this issue urgently.”
The ban is also backed by the RSPCA, Dogs Trust, Battersea, British Veterinary Association and Blue Cross.
The Animal Welfare (Electronic Collars) (England) Regulations 2023 was announced last year.
A Defra spokesperson said: “The UK is a world leader on animal welfare and we are fully committed to maintaining and enhancing our strong track record, including delivering the ban on hand-controlled electric shock collars.”
