A study will examine whether dogs form an emotional attachment to toys in a similar way to young children with blankets and teddies.
Researchers from the University of Bristol Vet School and School of Psychological Science will examine the behaviours of a wide range of dogs for the work.
It is thought that some breeds of dog may be more likely than others to form attachments with objects such as toys and bedding.
Professor Bruce Hood, of the University of Bristol's School of Psychological Science, said he was "fascinated" by the subject.
"We are conducting the first survey of this behaviour to see how common it is and to see whether particular breeds have particular traits or not," Prof Hood said.
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"We have a hypothesis that some breeds will have stronger attachments than others.
"We would like to hear from as many dog owners as possible - we need thousands to conduct a detailed analysis."
Previous research has estimated the number of Western children that form emotional attachments to soft toys and blankets at about 60 per cent.
Studies in the Far East have reported much lower levels.
Not all children form emotional attachments to soft toys, with a recent study finding that this is half to do with genes and half to do with the environment.
"Some dogs have toys as part of their routines, some dogs have been bred to be retrievers," Prof Hood added.
"This study is about all object related behaviour. We will also study other factors such as the dog's sleep pattern.
"It is not just about dogs who have an attachment to a toy, we need to include all the variations."
Dr Emily Blackwell, director of companion animal population health at Bristol Veterinary School, said owners had anecdotally reported that their dogs had attachments to particular objects.
"This study is the first large-scale systematic survey of the phenomenon," Dr Blackwell said.
"The results will provide fascinating insights into the evolution of social behaviour in both dogs and their owners alike."
