Certain dog breeds can run at speeds of around 30 mph, though this is not representative of all dogs.
Dogs can run 30 mph.

FactVerify
Source: factverify.com
Key Evidence
Sources consistently report that Border Collies can run up to 30 mph.
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Jack Russell Terriers and Dalmatians are also mentioned as reaching speeds around 30 mph.
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Most other dog breeds run slower, averaging between 15 and 20 mph.
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What the Evidence Shows
The claim that dogs can run 30 mph is generally accurate but applies primarily to specific breeds rather than all dogs. Several sources identify breeds such as Border Collies, Jack Russell Terriers, and Dalmatians as capable of reaching top speeds near 30 mph. For example, Border Collies are noted for their agility and speed, often cited with a top speed of about 30 mph.
Similarly, Jack Russell Terriers and Dalmatians can also reach speeds close to this mark. However, the average dog typically runs slower, around 15 to 20 mph. Greyhounds and some sighthounds can exceed 40 mph, which is faster than the stated 30 mph.
Therefore, while the statement is true for certain breeds, it is not universally applicable to all dogs.