What are some signs that a therapist may have poor boundaries with their clients?

Obsessing about clients outside of work hours.

Off the top of my ancient head:

These items can happen fleetingly, briefly, in any therapy, but if they’re frequent, it’s definitely time for the therapist to get some good, solid supervision/consultation.

Will friendly dogs protect their owners?

Serious disappointment when the client cancels a session.

Struggling with fantasies of deeper connections with clients, whether sexual or parental or other intense or intimate relationships beyond psychotherapy.

General Introduction to Boundaries from Panahi Counseling:

I took a video of my serve (60 FPS) and it took 0.4 seconds from my racket to the service line. How fast would you say my serve was?

Routinely going over the time limit with certain patients, compromising the time for the next client.

Failing to mention the client in supervision/consultation, out of fear the supervisor/consultant will advise return to ordinary healthy boundaries.

Disclosing feelings, fantasies, and experiences to the client in ways not related to the work the client is engaged in.

Which sunscreen shall we use to apply on oily skin?

Eager anticipation (or anxious anticipation) of the next session in ways that distract.

Session-expressed curiosities about client details not relevant to the therapy.

Sense of competition with persons who are important in the client’s life.

Is it okay for a wife who comes home from a date to tell her husband what she did?

Frequent phoning or texting of clients to “check up on them and make sure they’re OK.”