Sept 22 (Reuters) - Cheerios maker General Mills Inc reported better-than-expected first-quarter sales on Wednesday, as strong growth in its pet foods business cushioned a slowdown in demand for its cooking sauces and baking products.

Net sales rose to $4.54 billion in the quarter ended Aug. 29, from $4.36 billion a year earlier, beating the analysts' average estimate of $4.29 billion, according to Refinitiv data. (Reporting by Deborah Sophia and Praveen Paramasivam in Bengaluru; Editing by Aditya Soni)