Final answer:
The appropriate situation to notify the veterinarian is when the tooth exhibits excessive mobility but there is no bleeding during gentle probing.
Step-by-step explanation:
The question pertains to the evaluation of tooth conditions and when to bring them to the attention of a veterinarian. Among the given options, the appropriate situation to notify the veterinarian is when the tooth exhibits excessive mobility but there is no bleeding during gentle probing. This indicates a potential issue with the tooth's stability. In contrast, if the tooth appears normal and has some gingival margin recession or if it is chipped but lacks direct pulp exposure, there is no urgent need for action. Additionally, if the tooth and gingiva appear normal and exhibit movement greater than 1 min of mobility in any direction or if there is bleeding during gentle probing, it is not necessary to inform the veterinarian.