Donner said "I don't think it did as great business as it could have done because sentimentality of that sort is something I wasn't right for and I think I was fighting it. If I'd really gone for broke I think I would've done big, big business."
The Monthly Film Bulletin wrote: "This conventional boy-loves-dog story appears something of a retreat for the director, Clive Donner. His first film,
The Secret Place, in itself a not very original East End crime story, revealed a promising talent for characterisation and realistic settings, freshly observed.
Heart of a Child, with its mainly platitudinous dialogue and somewhat vague sense of time and place, lacks these virtues. Spiel, rather theatrically played by Donald Pleasence, never comes convincingly to life, and it is difficult to hold confidence in his abrupt reformation so soon after beating his son about the head with a log, and then refusing to help save his life when he is trapped in the snow. The boy is characterised with almost Dickensian sentimentality, and inexpertly played by Richard Williams. However, if young audiences can accept the happy ending without question, then they are not likely to be unduly critical of the somewhat inflexible direction and the heavily insistent music score. Jean Anderson acts with firm sympathy; and Rudi, the St. Bernard, is undoubtedly the film's best friend."
Filmink argued "who wants to see Donald soften at the love of a boy for his dog?" In
British Sound Films: The Studio Years 1928–1959 David Quinlan rated the film as "average", writing: "Heavily made tear-jerker doesn't touch the emotions." ==References==