Overlong, boring and loaded with dumb songs
At least "A Boy Named Charlie Brown" was reasonably substantive and even a bit educational, but this mess took a 30-minute story and watered it down to 90. By the time Snoopy (FINALLY) made his decision, neither I nor my children gave a hoot. The only thing they even smiled at was Thurl Ravenscroft's "NO DOGS ALLOWED!"
This was the all-time low for the Sherman Brothers, who had so many fine musical efforts for Disney. Vince Guaraldi was sorely missed. So was a decent screenplay.